59 



carinate. Of the latter some have the front of the head acute 

 or sub-acute, but two, Gaudichaudii and imbricata have the 

 front obtuse. M. Gaudichaudii in the ovigerous female has 

 the sides of the head broadly rounded, the eyes sub-rotund, 

 the inner ramus of the uropods falcate, M. imbricata of that 

 sex and condition has the sides of the head emarginate, the 

 eyes rhomboidal, the inner ramus often a little flexuous. 

 From J/, trigonocepliala (of Schiodte and Meinert), in which 

 the front of the head is sub-acute, M. imbricata is further 

 distinguished by having the front margin of the first peraeon 

 segment nearly straight instead of conspicuously bisinuate. 

 But Miers, who carefully investigated the synonymy, thinks it 

 not improbable that the original C. trigonocephnla. Leach, 

 ought to be regarded as a synonym of J/, imbricata, and 

 definitely includes in the synonymy as well the species which 

 Heller names CeratotJwa Ban/csii (Reise der Novara, Crust., 

 p. 148) as that which on the same page Heller describes as 

 C. trigonoccphala. 



The female attains a length of 57 mm. 



The species is recorded from the Indian Ocean, Java, New 

 Zealand, Australia and the Cape. 



Specimens sent me from the Cape were " from mouth of 

 fish, Kalk Bay," with the note that the species is " a 

 crustacean common in the mouth and gill cavity of the fish 

 here." 



The discussion of the mouth-organs of this species in 

 Hansen's " Cirolanidae " will be found especially valuable. 



COPEPODA PARASITICA. 



Gen. : Sphyrion, Cuvier. 

 1S30. '■'■ Lcs Sphyrions,^' Cuvier, Le Regne Animal, v. 3, 



P- 257- 

 1029-43. sphyrion, Guerin-Meneville, Iconographie du Regne 



Animal, Zoophytes, p. 11. 

 1840. sphyrion , Milne-Edwards, Hist. Nat. des Crustaces, 



V.3, P-525- 

 1845. Lestcs, Kroyer, Dan marks Fiske, v. 2, p. 517. 

 1 86 1. Sphyri()7i, Steenstrup and Liitken, Kong. Danske 



Vid. Selsk. Skrifter, Ser. 5, v. 5. Snyltekrebs og 



Lernaeer, p. 347 (7), 432 (92). 

 1864. Lestcira, Kroyer, Naturhistorisk Tidsskrift, Ser. 3, 



V. 2, pt. 3, p. 402. 

 1868. Lestcira, Heller, Reise der Novara, Crust., p. 228. 

 1890. Lesteira, G. M. Thomson, Trans. New Zealand 



Institute, v. 22, p. 370. 

 1899. Sphyrion, Bassett-Smith, Pr. Zool. Soc. London, 



pp. 441,488. 



