122 Mr. O. Thomas on the 



from Kames Bay, Loch Fyne, 10/25 fathoms. Walker (12) 

 also records this species from Puffin Island and Port Erin, 

 "encysted in the outer integuments of ascidians.-'^ 



Both T.gibhosa and D. thea are widely distributed through- 

 out tlie Clyde sea-area in depths up to 35 fathoms. 



^Yhile preparing this paper, I have been much indebted 

 to Canon Norman, F.R.S., who kindly gave me assistance 

 and advice and put at my disposal some of the literature on 

 the subject, which was not otherwise available to myself. 



EXPLANATION OF PLATE V. 



C. Ceplialon and anteniipe of male of Dexamine thea, Boeck. 

 gn. 1. S • First giiathopod of male of ditto, 



gn. 1*. Part of first giiathopod of male of ditto (greatly enlarged). 

 gn. 2. S ■ Second gnathopod of male of ditto. 

 gn. 1. 5. Propodal joint of first gnathopod of female of Tritceta 



gibbosa (Bate), showing abnormal structure. 

 gn. 1. Tg. Part of first gnathopod of male of T. gibbosa. 

 prp. d, 3, 4, 5. 3rd, 4th, and 6th peryeopods of male of Be.icmiine thea, 

 Boeck. 

 ep. 3. J . 3rd epimeral plate of male of ditto. 

 rip. 3. J . 3rcl uropod of male of ditto. 

 T. Telson of male of ditto. 



XIX. — The Species of the Oenus Dactylopsila. 

 By Oldf'ield Thomas. 



A RENEWED examination of the specimens in the British 

 Museum hitherto referred to Dactylopsila tnvirgata shows 

 that they may be readily separated into three species by the 

 coloration of tlie hands and feet, as indicated in the following 

 synopsis of the genus : — 



A. Fourth finger rather longer than others. 



a. Hands and feet wholly white. (N.VV, 



New Guinea and neighbouring is- 

 lands.) 1. I), trivirgata, Gray. 



b. Hands and feet not wholly white. 



d^. Hands and feet wholly black. (S.E. 



New Guinea.) 2. D. melamptis, sp. n. 



ft-. Metapodials and toes black, fingers 



and a band across ankles white. 



(N. Queensland.) 3. D. picata, sp. u. 



B. Fourth finger enormously longer than 



others 4. D.palpator,^l.-'EdiVf. 



Descriptions of the new Species. 

 Dactylopsila melamjnis. 

 General characters as in D. trivirgata, but in all the 



