164 ALEPAS PARASITA. 



A. aperturd non prominente, capituli longitudinis § 

 cequanie : scidis corneis : longitudine totd ad 2 uncias. 



Orifice not protuberant, equalling two thirds of the 

 length of the capitulum : scuta horny. Total length two 

 inches. 



Animal unknown. 



Parasitic on Medusae, Mediterranean and Atlantic Oceans : south shore of 

 England (?) * 



I have not seen this species, and have drawn up the 

 above specific character from the Plates and brief 

 descriptions in the Voyages of the Coquille and Astrolabe. 

 M. Lesson thinks that his species differs from that of 

 M. Quoy and Gaimard ; but as the peculiar yellow colour 

 of the capitulum, general shape, short cirri, habits and 

 range, are all common to both, I believe that they are 

 identical. There is, however, one singular difference, 

 namely, that the cirri are coloured bright blue in the 

 Plate in the Voyage of the Astrolabe, and yellowish 

 in that in the Voyage of the Coquille : this possibly may 

 have resulted from the drawing in the latter case having 

 been made from a specimen long kept in spirits. 



M. Lesson says that there are seven pair of cirri, from 

 which I infer that this species has a pair of long, articu- 

 lated, caudal appendages : he asserts that each cirrus has 

 ten segments ; the cirri are short and little curled. 

 M. Lesson remarks, that " deux languettes bifurques 

 occupent le bas de 1'ouverture ovale*/ I can hardly 

 doubt but that these are horny scuta of nearly the same 

 shape as in A. minuta. The whole animal seems to be 

 extremely transparent, and of a " jaune-citron clair.' 3 

 MM. Quoy and Gaimard, however, remark, that different 

 specimens vary from white to yellow. Entire length two 

 inches, of which the capitulum is fourteen French lines. 

 The peduncle is narrow and short. 



name univalvis is too obviously false to be retained. With respect to the 

 generic name Triton, I fully believe that it was applied by Linnaeus to the 

 cast-off exuviae of sessile Cirripedes. 

 * See Eoot-note, p. 159. 



