156 Dr. W. T. Caiman on the 



Leptostraca are intimately related to the Malacostraca, and 

 their position seems best expressed by Grobben's * arrange- 

 ment, which divides the subclass into two main groups, 

 Leptostraca and Eumalacostraca. # 



The Stomatopoda must form a division of equal rank with 

 the Eucarida and Peracarida. To preserve the consonance 

 of names I propose to term it Hoplocarida. The morphology 

 of the members of this group has been somewhat neglected, 

 and their precise relationship to the other orders is by no 

 means clear. Their internal anatomy is imperfectly known 

 and would doubtless repay investigation f. 



Classification here proposed. 

 Subclass MALACOSTRACA. 



Series Leptostraca, Claus, 1880. 



Division Phyllocarida, Packard, 1879. 



Order Nebaliacea, nov. nom. 



Series Eumalacostraca, Grobben, 1892. 

 Division Syncarida, Packard, 1886. 



Order Anaspidacea, nov. 



Division Peracarida, nov. nom. 



Orders Mysidacea. 

 Cumacea. 

 Tanaidacea. 



Isopoda. 

 Amphipoda. 



Division Eucarida, nov. nom. 



Orders Euphausiacea. 

 Decapoda. 



Division HorLOCARiDA, nov. nom. 



Order Stomatopoda, 



Series LEPTOSTRACA. — Abdomen of seven somites, the 

 last of which is without appendages, and a telsou bearing a 



* " Zur Kenntniss des Stammbamnes und des Systems des Crustaceen," 

 SB. Akad. Wien, ci. (1892) Abth. i. pp. 237-274. 



+ Kowalevsky states (Biol. Centralbl. ix. (1889) p. 41) that the max- 

 illary gland (" shell-gland ") is greatly developed iu the Stomatopoda, 

 but I cannot tind any description of it. I have observed on the posterior 

 surface of the maxilla in Squilla mantis a papilla with a minute terminal 

 pore which may be the aperture of the duct of this gland, but I have 

 had no opportunity of dissecting well-preserved specimens. 



