1895.] PKOF. A. JIILNE-EDWAEDS ON A NEW OEAB. 239 



Fam. PEEICHiETID^. 



Of this family there was but a single specimen in the collection, 

 belonging to the genus PericJiceta, 



(1) Perichseta sancti-jacobi, u. sp. 



As I have already pointed out, the genus Perichceta is far from 

 abundant in South America. Indeed only one species, viz. P. elan- 

 (jata, is at all well-known, and that species is by no means exhaus- 

 tively described. As for P. dici/stis and P. trici/stis of Perrier, they 

 are only known by the number of spermathecse which they respec- 

 tively possess. The present species may or may not be identical 

 with one of these. In the meantime I give it a new name. The 

 single specimen measured 70 mm. by 5 mm. in breadth. The 

 number of segments is 75. The colour (in alcohol) a greenish brown. 

 The clitellum occupies segments xiv.-xvi. and is complete. There 

 are sette (about 16) on the last segment of it. 



I detected no genital papillae. There are about ten setae 

 between the male pores. 



The gizzard, as usual, is in segments viii., ix. The intestine 

 begins in xv. 



The last heart is in segment xiii. 



The sperm-sacs are in segments x., xi., xii. 



The spermathecae are in vi., vii. ; each is a pear-shaped sac with 

 a narrow tubidar diverticulum ending in a swollen extremity. 



The spermiducal glands are soHd, though much lobulated. The 

 duct is short and straight, without any terminal sac, which is so 

 frequently present in the species of this genus. There are of 

 course no penial setae. 



Hab. St. 1, Santiago, Quinta normal. 



2. Description of a new Species of Crab of the Genus 

 Hyastenus. By Prof. Alphonse Milne-Edwards. 

 (Communicated by Prof. F. Jeffrey Bell^ M.A.^ 

 Sec. R.M.S., F.Z.S.i) 



[Eeceived March 11, 1895.] 



Hyastenus consobeinus, sp. nor. 



Cette espece ressemble beaucoup a V Hyastenus spinosus ^ ; elle 

 n'en differe que par des caracteres de faible importance et, quand 



^ Being uncertain as to the exact position of this Crab, I submitted it to the 

 examination of the learned carcinologist who has lately investigated the 

 Crustacea of Cape Horn, and I have been favoured by him with the description 

 which I submit to the Society. 



- A. Milne-Edwards, Nouvelles Archives du Museum, Memoires, t. viii. p. 250 

 (1872). 



