74 



pretends that these legs are shorter than twice the said length. Basi- and ischiopodite with a 

 sharp spine at distal margin, on the ventral side; these spines are continued along the posterior 

 border of the meropodite, larger, curved spines generally alternating with obtuse prominences; 

 in the last pair of legs these spines are almost absent. Propodite in the first pair somewhat 

 distorted, so that the originally ventral side, which is greatly flattened and granular and forms 

 a broadly-oval disc, nearly as broad as long, is turned to the dorsal side of the animal ; 

 dactylus broadly-triangular, depressed, as long as the preceding propodite, finely crenulate at 

 the base of the lateral margins, and somewhat curved upward. In the middle pairs of legs 

 the propodites are elongate, normal (in the third pair about three times as long as broad), 

 and the dactyli long, greatly compressed, nearly straight. The propodite of the last part of 

 legs is again short, fringed with very long, feathered hairs, and the dactylus is short, com- 

 pressed, curved backward. 



There is little difference between the abdomina of the sexes, that of the 9 being narrow, 

 like that of the cf ; all the segments are distinct. None of my 9 is bearing eggs. The base 

 of the abdomen of the cf occupies about two-fifths of the distance between the posterior pair 

 of legs, the third segment is narrower than the first, the fifth somewhat constricted, the terminal 

 segment is semi-circular (see Miss Rathbun's figure), and reaches to the buccal cavity, from 

 which the trench of the abdomen is, however, separated by a thin lamellar, movable plate, 

 beneath which the anterior margin of the sternum projects in the form of a triangular tooth. 

 The long first abdominal appendages, of the cf are obtuse at the tip, which is armed with a 

 bunch of slender spines. 



This species has been caught at the Philippines, in the harbour of Hongkong, near 

 Batavia, in the Gulf of Martaban and in that of Siam. According to Sluiter it is not com- 

 mensalistic in habits. 



Dimensions in mm.: 



Length of carapace 



Breadth of carapace 



Length of penultimate pair of legs 



9 

 4.85 



7-15 

 10.2 



Subfam. ASTHENOGNATHINAE. 



No subfamily of the Pinnotheridae contains such heterogeneous elements as the present 

 one. In some genera {Asthenognathus, Tritodynamia, Mortensetiella) the last pair of legs is so 

 very much reduced in size as to suggest a striking resemblance to what is found in Pinnixa 

 etc., the more so because in one of these genera the carapace is sometimes twice as broad as 

 long. As has been remarked already Pinnixa and its allies nearly resemble some genera of 

 the subfamily Hexapodinae, which belong to the Goneplacidae. Perhaps a more direct link to 

 the latter family, viz. to the Rhizopinae, is afforded by Chasmocarcinops^ which much resembles 

 Camatopsis: in these genera not only the carapace and the legs are very much alike, but the 

 antennulae in both are not capable of being completely retracted, the basal joint completely 



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