Col. C. Svvinhoe on new Species ofLycamidse. 44 



sexual products may not develop simultaneously in one indi- 

 vidual. 



There is a very large " nerve-rod " on the left side, which 

 is a clear solid structure surrounded by the epidermal cells 

 and having a finely fibrillated or perhaps only coagulated 

 structure. This rod extends through a considerable part of 

 the length of the animal and ends in the peculiar ring of 

 epidermal nerve-substance surrounding the mouth and espe- 

 cially well developed near the anus. At this point there are 

 two symmetrically placed and closely approximated nerve- 

 rods, of which, however, only the left one could be traced. 

 The right rod appears not to extend far and to be atrophied 

 as compared with the condition in P. australis. 



Blood-vessels, septa, supporting framework, and nephridia 

 seem essentially like those of P. australis as far as was deter- 

 mined. 



In live specimens the flow of blood in the branchiae, the 

 contraction of the vessels and the cilia in the anterior region 

 of the trunk were observed. 



The Actinotrocha taken at Beaufort resemble the " species 

 B " described by Wilson from the Chesapeake Bay. 



The distinctive characters of P. architecta are thus : — The 

 formation of isolated tubes covered by definite collections of 

 sand-grains ; the presence of special prostomial organs, possibly 

 of use in formation of these tubes ; the great development of 

 the longitudinal muscles ; the presence of a ciliated groove in 

 the digestive tract ; the apparent separation of the sexes. 



As far as observed the characters of this species favour a 

 nearer approach to the Sipunculid, and thence to the Annelid 

 type, rather than to the Polyzoa on the other hand. 



Baltimore, 

 April 19, 1890. 



LVIII. — Descriptions of three new Species o/Lycsenidse. 

 By Colonel C. Swinhoe, F.L.S., F.Z.S., &c, 



Lycaenidae. 



1. Arhopala viridissima } n. sp. 



<J. Upperside : fore wing glistening metallic green, veins, 

 costal line, and outer marginal band black, the latter com- 

 mencing very finely at the apex and gradually broadening on 

 Ann. & Mag. N. Hist. Ser. 6. Vol. v. 32 



