16 N A NEW TYPE OE MALACOSTRACOTTS CRUSTACEAN. 



the bases of the last two pairs of legs, is now known to be a sperm-receptacle *. In the 

 Lobster (Homarus) a sperm-receptacle in the same position has been described by 

 Bumpus t, and in the Crayfishes of the genus Cambarus a similar structure is known as 

 the " annulus veutralis." Andrews % does not consider the structures in the Lobster and 

 Crayfish to be homologous, and does not refer to that of the Penaeidse. It seems probable, 

 however, that a comparative investigation of the three types of organ in the Decapoda 

 together with that of the Syncarida might yield results of interest. 



The most striking and unexpected character of Koonunga is the sessile condition of the 

 eyes, which makes still more plain the impossibility of continuing to regard the two 

 genera as " Schizopoda." I see no reason to modify the opinion which I formerly 

 expressed §, that Anaspides must be regarded as representing a distinct Order, forming 

 by itself a Division of the Eumalacostraca, to which Packard's name Syncarida has been 

 given. To this Order Koonunga must now be added, and I do not think that the 

 modifications thereby rendered necessary in the definition of the group in any way impair 

 its distinctness from the other Divisions of the Malacostraca. 



* Kishinouye, "Japanese Species of the Genus Penmis," Journ. Fisheries Bureau, Tokyo, viii. No. 1 (1000). 

 t " Embryology of the American Lobster," Journ. Morphology, v. p. 216 (1891). 



X E. A. Andrews, " The Annulus Ventralis," Proc. Boston Soc. Nat. Hist, xxxii. No. 12, pp. 427-479, 

 pis. xliii.-xlviii. (1906). 



§ "On the Classification of the Crustacea Malacostraca," Ann. & Mag. Nat. Hist. (7) xiii. p. 155 (1904). 



