2(58 CEYLON PEARL OYSTER REPORT. 



One specimen only, and that possibly an immature one, was found in the 

 Muttuvaratu pearl oyster washings. It is nearly related to T. malleolata, with 

 which we were at first disposed to place it. The 5th leet are, however, very different 

 from, and the furca much shorter than in that species, so that it seems necessary to 

 separate the present form. 



Tetragoniceps minor, n. sp. Plate VIII. , figs. 23 to 28. 



Length, female, 0'5 millim. ; male unknown. 



Closely related to T. bradyi ' ; differing, however, from that species in the jointing 



of the anterior antennae, and in the long narrow furcal rami. Anterior antennae 



1 2 3 45678 

 8-iointed, the proportional lengths being as follows : A long 



beak-like hook projects from the 2nd joint, by which it differs from T. consimilis. 



The posterior antenna?, the mouth organs, and the 5 pairs of natatory legs are 

 much the same as those of T. bradyi. 



One specimen only was found in Muttuvaratu pearl oyster washings. The beaked 

 2nd joint of the anterior antenna? sufficiently distinguishes it from others of the 

 genus. 



Dactylophusia tisboides (Claus). 

 This littoral species was taken between Port Said and Suez. 



Dactylophusia latipes (T. Scott). 



Taken sparingly on the Ceylon pearl banks. Only previous record is Gulf of 

 Guinea. 



Dactylophusia dentata, n. sp. Plate IX., figs. 1 to 10. 



Length, female 1*2 millim. ; male 0'83 millim. 



Cephalothorax robust ; cephalic segment about as long as the rest of the thoracic 

 segments combined. Third and fourth segments have remarkably sharp dorsal teeth ; 

 abdomen narrow, little more than one-third the length of the cephalothorax ; lateral 

 margins of genital segment produced into a large blunt tooth. Anterior antenna? 



8-iointed, the proportional lentrths being as follows : 

 J i l & & 10. 11. 8. 9. 3. 4. 3. 4. 



The prolonged apex of joint 4 bears a long broad filament. Inner branch of 

 posterior antenna? 2-jointed. Mandible palp 2-branched, the primary branch having 

 long terminal seta?. Second maxilliped has an angular hand and terminal claw of 

 about the same length. Both branches of 1st pair of natatory legs 3-jointed ; the 

 basal inner joint half as long again as the entire outer branch ; the other joints very 

 small. 



In the male the 2nd joint of inner branch of 2nd pair is produced into a long 

 pointed dagger-like spine, broad at base. Fifth pair of female 2-jointed, foliaceous, 



