OP THE CEUSTAOEAN" GENFS BATHYNELLA. 341 



by Vejdovsky as the first abdominal, but bere regarded as the last 

 thoracic somite, bears a pair of short appendages. These are 

 described as consisting of two branches, an inner two-jointed 

 stem, and an outer " penis-like process," the latter being appa- 

 rently connected witli the male genital duct. The appendages 

 in question are now, unfortunately, so shrivelled tliat nothing 

 can be made out as to their structure, but the position of the 

 "penis-like process" on the outer side of tlie limb is so unusual 

 that we are led to suspect some error in this part of the 

 description. 



The appendages of the first abdominal somite (second ab- 

 dominal of Vejdovsky) are uniramous and two-jointed. The 

 four succeeding somites appear to lack all trace of appendages. 

 The last segment of the body bears terminally two pairs of 

 " Schwanzplatten," a dorsal and a ventral. The ventral pair are 

 described as consisting of two joints, each with a row of stout 

 curved setae along its distal edge, and of a small unjointed 

 exopod inserted near the distal end of the first joint. These 

 appendages, of which only the basal parts are now preserved, are 

 clearly the uropods or appendages of the sixth abdominal somite ; 

 but it is not quite so easy to interpret the dorsal pair of " caudal 

 plates." These might be regarded as the two halves of a deeply 

 divided telson, such as occurs in many Amphipods, but their 

 cylindrical form and the fact that each is very distinctly divided 

 into two segments seem rather to suggest a comparison with the 

 " caudal furca " characteristic of Phyllopods, Copepods, and 

 other Entomostraca, and which also occurs in Nebalia and in 

 some larval Malacostraca. . 



The presumed gonads, which have been already referred to, are 

 described as a pair of tubular organs lying in the abdomen, each 

 expanding in the last thoracic somite into a vesicular dilatation 

 which in turn appeared to communicate with the " penis-like 

 process." There can be little doubt that these organs constitute 

 the male generative system. No other internal organ could be 

 distinguished save a pair of oval " glandular " bodies of unknown 

 significance, lying in the last somite of the abdomen. 



Eeviewing the characters here summarized, it seems plain, in 

 the first place, that Bathjnella, in spite of its minute size, must 

 be referred to the Malacostraca. The number of the somites, 



LIWK. JOUEN. ZOOLOGY, YOL. XXYII. 26 



