348 Miscellaneous. 



is oval and bears two denticles on the side which faces the oppo- 

 sable tooth. The sixth pair of thoracic limbs, which is so impor- 

 tant in characterizing the Entonisci, in no way resembles those of the 

 known species. It is composed of five joints : that which corresponds 

 to the hand of the other pairs is more elongated, and terminates at 

 its inner margin in a smaU. fixed tooth ; its external margin is pro- 

 duced into a straight bacillus, as long as the joint which bears it, and 

 furnished at its extremity with a tuft of rigid hairs. 



The five pairs of abdominal limbs are all constructed in the same 

 fashion. The terminal setigerous joint presents a straight margin 

 which bears two rays ; a third is inserted at the extremity. The 

 heart is situated at the dorsal part of the first abdominal segment ; 

 it is found in the same place in the adult, where it never projects 

 into a sac as in Ihitoniscus porcellcmce. 



These embryos live very well in sea-water, in which they swim 

 in the manner described by Fritz Miiller, — that is to say, with the 

 body bent towards the ventral side and the sixth pair of thoracic 

 legs projecting on each side. 



The second species that I have observed is much rarer. It lives 

 as a parasite in Portiums puher ; and whereas one may meet with an 

 Entoniscus CavolhiH in about every thirty specimens of the Gra2)sus, 

 the parasite of the Velvet-Crab does not occu.r in the proportion of 

 more than 1 per cent. Moreover I have observed the latter only 

 in Portuni collected at the island of Levcn, opposite the point of 

 Pen-Chciteau. I have found two in the same Portunus. This 

 species I name Entoniscus Moniezii, dedicating it to my preparator, 

 R. Moniez. 



E. Moniezii differs from E. CavoUnii in the colour of its ovige- 

 rous sac, which, at maturity, is of a nankeen-yellow colour, and not 

 lead-grey as in the parasite of the Oraj>sus. The ovarian gland is 

 yellow with a rose tinge ; it is straw-yellow in E. CavoUnii. A 

 female of E. Moniezii not yet entirely degraded has enabled me to 

 study more thoroughly the phenomena of retrogression presented by 

 these Tsopods. The description of these phenomena will form the 

 subject of a detailed memoir, in which I shall also indicate the taxo- 

 nomic results which I have obtained by the study of the Isopoda 

 of the family Bopyridae. — Comptes Rendus, August 12, 1878, 

 p. 299. 



Note on the Saurus lucioccps of Ayres. 



By W. N. LOCKINGTON. 



Saurus lucioceps, Ayres, Proc. Cal. Acad. Sci. 1855, p. 69. 

 Saurus foetens ?, Cuv. & Val. xxii. p. 471 (teste Giinther). 



A large specimen of the fish described by Dr. Ayres was pre- 

 sented to the California Academy of Sciences, August 19, 1878, 

 and has been examined by Mr. W. G. W. Harford, the Director 

 of the Museum, and myself. 



