II. NOTES ON DECAPODA IN THE INDIAN MUSEUM. III. The Species obtained by R.I.M.S.S. ' Investigator ' DURING THE SURVEY SEASON I9IO-II. By Stanley Kemp, B.A., Assistant Superintendent, Indian Museum, and R. B. Seymour Seweli., B.A., Capt., IMS., Surgeon Naturalist, Marine Survey of India. (Plate i.) During the season 1910-11 it was unfortunately onl}^ possible to make four hauls of the trawl in deep water ; but at one of the stations a large number of interesting Decapod Crustacea were obtained and, inasmuch as many of these species appear to be rare, we have thought it as well to draw up a few notes on the collection. The only species hitherto undescribed is a Macruran of the genus Merhippolyte, the first representative of the family Hippoly-tidae which has yet been found in deep water off the coasts of India. A small crab, allied to the genus Carcinoplax, also seems to belong to a species as yet unknown ; this specimen is being referred to Col. Alcock and is not included in the present account. Of the others in the collection perhaps the most interesting is the male of Aristeomorpha rostridentata (Bate), a species previously known from females only. Pentacheles hextii of Alcock is identified with the Atlantic and Mediterranean Polycheles typhlops and our knowledge of the distribution of several other scarce forms has been considerably extended. The stations at which the collection was made are all situated off the S.W. coast of India ; they are — St. 388. 26-iv-ii. f 44' 10" N., 76° 35' 45" E. 670 fathoms. St. 389. 27-iv-ii. (f 01' 50" N., 75° 55' 50" E. 81 „ A considerable number of corals (Caryophyllinae) were obtained at this station. St. 390. 27-iv-ii. 9° 09' N., 75° 46' E. 260 fathoms. On this occasion the net caught on a rock and was badly torn. No Decapoda were taken. St. 391. 27-iv-ii. 9° 14' 10" N., 75° 45' E. 237 fathoms. This haul was remarkable for the large number of the Gas-tropod, Xenophora pallidula, which were obtained. The majority of the Decapoda which form the subject of the present paper were found at this station.