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Show 152 REV. O. P. CAMBRIDGE ON THE GENUS IDIOPS. [Mar. 10, sence of the pseudobranchiae cannot be retained among the family characters, and is limited to the former genus. Prototroctes stands in the same relation to Haplochiton as Coregonus does to Salmo; and however the Haplochitonidce may differ from the Salmonidce in the structure of the jaws and intestinal tract, it is a most remarkable fact that the fresh waters of the southern hemisphere are inhabited by two genera with adipose fins, so extremely similar in outward appearance to the northern Salmonoids. The species from Southern Australia is called Prototroctes marcena, and distinguished by having about eighty transverse series of scales along the body. The second species, from New Zealand, is very closely allied to it, but more elongate and having smaller scales. D. 12. A. 19. Transverse series of scales 100. The height of the body is nearly one-fifth of the total length (without caudal) ; the head is as small as in the other species, its length being contained six and a half times in the total (without caudal) ; the same uniform coloration as in Coregonus. For this species I propose the name of Prototroctes oxyrhynchus. The fish were sent with the denomination " Mountain-Trout;" therefore it appears that they inhabit the fresh waters of the mountainous interior of New Zealand. The stomach and intestines were crammed full of a clayey mud, which may have been taken in on account of nutritive matter contained in it, or which may be the remnants of worms which had fed on mud. 7. Supplementary Notice on the Genus Idiops. By the Rev. O. P. CAMBRIDGE. (Plate VIII.) Since writing the communication upon the genus Idiops read at the Society's Meeting on the 10th ult.*, I have discovered, in the collection of Arachnida at the British Museum, three additional undescribed species-one from the same locality as that from which Idiops sigillatus was received (Swan River, Australia), the two others from Africa (one from its eastern the other from its southern portion). The distribution of this genus thus appears to be exceedingly wide, comprising Syria, different parts of South America, Africa, and Australia. The following are the descriptions that I have been enabled to make of these additional species :- IDIOPS ME-ADII, n sp. (Plate VIII. fig. 4.) Male adult: length 10 lines; length [of cephalothorax 6 lines, breadth of ditto 4 | lines. The whole of this Spider, except the abdomen, is of a deep and somewhat bistre-brown colour. The cephalothorax is of a broad * See antea, p. 101. |