306 THE VOYAGE OF H.M.S. CHALLENGER. 



form ; end of abdomen adapted for swimming but not for leaping. The species of this tribe 

 are more or less parasitic, some of them being attached to Fishes, and others to Medusae." 

 The "Fam. Phronimadw," and " Fam. Dulichiad^, Sjience Bate," are placed in this tribe. 

 To the Phronimadas he assigns L Hyperia, with the species " LatreiUii," MLbie-Edwards, 

 figured plate xi. fig. 3, and ohlivia, Milne-Edwards, remarking that Spence Bate regards 

 " Hyperia LatreiUii " as synonymous with " C. Gammarus Galba " of Montagu ; 2. Metoecus, 

 Kr0yer, with the species " Metoecus Medusarum, O. Fabr., sp.," as described by Gosse ; 3. 

 Phronima, with the species sedentaria, figured pi. xi. fig. 4, the account of which is 

 followed by the remark, " "We have apparently in the British Islands more than one species 

 of the family Typldilx; they are not well made out. The antenna; in this family are 

 inserted on the lower part of the head, and are folded three or four times on each other." 

 This is no doubt added to explain the omission of Typhis nolens, Johnston, which is 

 included in the Synopsis. 



The " Fam. Dyopedid^ " of the Synopsis, with the genus Dyopedos, Spence Bate, and the two 

 species Dyopedos porredus and Byopedos falcatus here become on Spence Bate's authority 

 " Fam. DuLiCHiADiE, Spence Bate," Gen. Dulicliia, Kr0yer, species, Dulicliia porrecta, 

 Spence Bate, and Didicliia porrecta, Spence Bate. 



Of " Order II. Ljimodipoda," White remarks that " Mr. Spence Bate merges this Order in 

 Ampliipoda." Several of Gosse's observations on the shape and habits of Caprella are 

 quoted. The arrangement, not of the Synopsis, but of White's own Catalogue of British 

 Crustacea, 1850, is here followed. Caprella tuberculata, Goodsir, is figured pi. xi. fig. 5, 

 a representation which, but for the size of the species, would suggest rather Caprella 

 acuUfrons, Latreille, than CapircUa tuberculata. Bate and Westwood, or Ccqirella linearis 

 (Linn.), Bate ; the figure appears to have been copied on a reduced scale from Goodsir, 

 with the line indicating the natural size reduced to match ! Caprella lohata, MiiUer, of the 

 Catalogue, does not re-appear, Caprella spinosa, Goodsir, is added, and described as similar 

 to Caprella phasma, ^Montagu, but differing " chiefly in the first thoracic segment having 

 five spines." Its segments also, he says, are considerably longer, and adds that " Mr. Bate 

 refers this with doubt to the genus Protella of Dana, and to the species named ^gina 

 loncjispina by Kr0yer." To Proto he adds the species " Proto Goodsirii," Spence Bate. 



The " Fam. Ctamid^ " are thus described : — 



" Body depressed, oval. Eyes compound ; two very small ocelli on vertex ; antennae very close 

 together at the base. Five pairs of legs, more or less prehensile ; second and third joints 

 of the thorax without legs, but bearing very long cylindrical respiratory appendages, which 

 are generally bent over the back. The species of this family are parasitic on the whale and 

 dolphin. They gnaw the rough thick skin of these marine animals more or less deeply. 

 There seem to be several species of Cyainus, attacking different parts of the bodies of these 

 bulky beasts, some preferring the head and others the fins and other parts of the body." 



" Gen. Ctamus, Latr. Head small, truncated, united to first thoracic segment. The characters 

 of the genus are those of the family. 



" Cyamus ceti, Wliale Louse (Plate XI. fig. 6.) — Branchial appendages simple, and furnished at 

 the base with two unequal and pointed upper edges. Under the fins, etc., of the whale. 



" Cyamus ovalis. — Body much wider than in last, fom- pairs of branchial appendages in both 

 sexes, those of third ring with a single short slender appendage at the base, those of the 

 fourth ring with two of unequal length. Lives in clusters on the hard projections of head 

 of whale. 



" The Cyamus (jracilis and Cyamus TJwmpsoni are also recorded as British ; the latter was found 

 on a dolphin and is described 1 / Mr. Gosse." 



Savigny's mistake about the eyes is retained in the description of the family. The figure of 

 Cyamus ceti is criticized by Liitken as not good. Lutken also thinks it quite unreasonable 



