236 Dr. A. Giinther on the Hapuku of New Zealand. The structure of each retinula is therefore clearly very similar to that of the retinula of many mollusks as described by Patten, and, which is more important for purposes of com-parison, to Nereis among Annelids if Patten's interpretation * of Carri^re's figures be allowed. The two central clear cells are Patten's ' retinophorffi.' It will be observed, however, that apart from these two problematical hyaline cells the minute structure of the eyes of the SerolidfB and Cymotho-idge bear out Grenacher's conclusions rather than Patten's with regard to the morphology of the Crustacean eye. There can be no doubt that the crystalline cone is independent of the rhabdom and formed by different cells. The specialization of the retinula-cells is, however, a new feature, and distinguishes the eye of these Isopods. XXVI. — Note on the Hapuku of New Zealand (Polyprion prognathus). By Dr. A. Gijnthee, F.K.S. The Hapuku of New Zealand, one of the most highly esteemed food-fishes of the southern hemisphere, and attaining to a weight of 100 pounds, has been known to naturalists since Cook's visits to that country, as has been shown by Mr. Hutton (Trans. N.-Z. Instit. v. p. 259). It was figured by Forster as well as by Parkinson, the former naming it Pe7'ca prognatlms, a very appropriate term, to which I give prefer-ence before all others, although Schneider (Bl. Schn. p. 301) arbitrarily changed it into the less expressive Epinephelus oxygeneios. Forster's original description is published in '■ Descript. animal, ed. Lichtenstein,' p. 309, and referred to by Cuvier (Cuv. & Val. Hist. Nat. Poiss. iii. p. 29), who, with his perfect knowledge of fishes, recognized its relation to Polyprion, not doubting that it was the same species as the Atlantic P. cernium. The figure left by Parkinson bears tlie name Scicena qadoideSy probably in Broussonnet's handwriting ; but this name seems to have remained always a MS. name. The second period of the history of this fish begins with Owen, who, in the ' Osteological Catalogue of the College of Surgeons,' i. p. 51, described the skeleton of a New-Zealand Percoid under the name of Gentropristis gigas. In the ' Catalogue of Fishes,' i. p. 251, I stated the reasons which * Mitth. Zool. Stat. Neapel, 1886.