I Mr. J. Miers on some of the Heliotropiege. 121 EXPLANATION OF THE PLATES. Plate LX. Fig. 1. First stage of development of Pagurus*. Fig. 2. Second stage. The author gives this with the reservation stated, having taken it swimming in the open sea. c, dorsal view of cephalon ; a, eye ; b, superior antennae ; c, inf. ant. ; d, mandible ; g, posterior maxilliped ; h, first pair of gnathopoda ; I, second pair ; k, first pair of pereiopoda ; I, m, n, o, three posterior pairs of pleopoda ; p, q, t, pleopoda ; m, sixth pair of pleopoda ; z, telson. Fig, 3. Third stage, representing the genus Glaucothoe of Milne-Edwards and Frophylax of Latreille : w, penultimate pair of pereiopoda ; o, ultimate pair of pereiopoda \ p, a pleopod ; w, sixth or poste-rior pair of pleopoda ; z, telson ; p, pleon of an older specimen. Fig. 4. Zoea of Porcellana platycheles : z, telson. Plate X. Fig. 1. Phyllosoma. Fig. 2. Zoea of Palinurus marinus. Plate XI. Fig. 1. Tgpton spongiosus, n. sp. References as above. Fig. 2. Alpheus Edwardsii. Fig. 3. Mandible of Nika edulis. Fig. 4. Homartis marinus. Development of flagellum to lower antenna. Ftg. 5. Tanais : h, first pair of gnathopoda, with branchial appendage attached. XI. — Observations on some of the Heliotropieae. By John Miers, F.R.S., F.L.S., &c. In the ^ Prodromus ' of De Candolle we find the order Borra-ginecB divided into four distinct tribes, the CordiecBj Ehretiecej Ileliotropiecej and Borragece. Long before the appearance of that work, the late Mr. R. Brown had pointed out, in his ^ Prodromus/ p. 492, that the Cordiem ought to be held as a distinct family, on account of their 4-fid style, and their seeds without albumen, with plicated cotyledons — an opinion sup-ported by Endlicher and Lindley for reasons which appear sufficiently valid. Yon Martins rightly held that the perfectly gynobasic style, placed in the middle of four distinct ovaries, entitled the Borragece to rank as a separate natural order, and accordingly he combined the two remaining tribes of DeCan-doUe, the Ehretiece and HeliotropiecB^ in another family, which he designated with the name of Ehretiacece. The uncertainty and confusion in the distribution of the species in these several groups have in great measure arisen from a neglect to examine the structure of the fruits ; it may, however, be taken as a rule that among the whole of them it is essential that the seeds * This was taken so young from the ovum that I am not certain whe-ther the long projecting rostrum is a feature or not, as at this period it is generally folded under.
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