256 CEYLON PEARL OYSTER REPORT. 



Sunaristes inopinata, n. sp. — Plate III., figs. 1 to 8. 



Length, male 1'3 millims. ; female 1*5 millims. 



Body resembling S. paguri, but all the segments broader in proportion to length. 

 Anterior antennae of female 6-jointed, densely covered on the upper side with 

 plumose setae and bearing two long club-like ajopendages, possibly olfactory. 



1 2 3. 4 5 6 



The relative lengths of the joints are as follows : — — ' ' ' ' , _' 

 & J 11. 7. 7. 5. 4. 15. 



Anterior antennae of male short and broad, terminating in a curved hook. 



Posterior antennae and mouth organs as in S. paguri. Both blanches of 1st to 4th 



pairs of natatory legs 3-jointed, most of the joints having small bundles of fine hairs 



on the surface or at the sides. Fifth pair as in S. paguri. 



Abdomen about the same length as the cephalothorax, composed of joints of which 



the genital segment is the larger one. Furcal rami twice as long as the breadth, 



tapering to the apex, and each having a stout spine on inner margin. Several 



specimens were found in the general washings from Ceylon Invertebrates. 



Sunaristes longipes, n. sp. — Plate III., figs. 9 to 11. 



Length, female 1'5 millims. ; male unknown. 



Similar in build to the last species but more robust. Anterior antennas 6-joiuted 



and similar to S. inopinata, except in proportional lengths of joints, which are as 



1. 2. 3. 4. 5. 6. 



follows : — — - — —— — — - 



15. 7. 3. 5. 3. 19. 



Abdomen short and robust, about equal in length to the first 3 thoracic segments. 

 First 2 joints are coalescent, the 4th and especially the 5th very small. Furcal 

 rami long and tapering, the length 3 times that of the breadth ; each has a spine 

 on both sides. Mouth organs as in Longipedia, Canuella and Sunaristes. Other 

 organs as in last species, with the exception of 4th pair of natatory legs, which (fig. 10) 

 are very narrow, the inner branch being nearly double the length of the outer one. 



The length of the furcal rami and the elongated 4th pair of natatory legs serve to 

 distinguish this species from others of the genus. One specimen only, a female, was 

 found in the general washings from Ceylon Invertebrates. 



Sunaristes curticaudata, n. sp. — Plate III., figs. 12 to 17. 



Length, female, 1'6 millims. Male unknown. 



First segment of cephalothorax equal in length to that of the four following 

 segments combined, and much broader. Abdomen 4 -jointed, about three-fourths of 

 the length of the cephalothorax. Anterior antennae 4-jointed, all adorned witli 

 plumose setae, the second joint having also two spines. The proportionate lengths 



are a* follows: J^AAjL 

 12. 16. 5. 7. 



Mouth organs as in Longipedia, Canuella and Sumiristes. 



