DESCRIPTION OF A NEW COPEPOD. By Thomas Scott. 



(PL VIII. figs. 7-12.) 



Avtotvogns papillaris, n. sp. — In general appearance this species is not 

 very unlike A. Normani, Brady and Robertson. 



The first segment is equal in length to rather more than half of the 

 whole body, or as 21 is to 19. 



The anterior antennae are eight-jointed, stout, bearing comparatively few 

 setae, and each is terminated by a long curved olfactory appendage. The 

 relative lengths of the joints are as follows : — 



12 3 4 5 6 7 8 



14.44. 14.9.12.11.14.29 



The terminal joint has a distinct curved band stretching across it near the 

 middle, which in certain positions gives it the appearance of being two- 

 jointed. 



The last joint of the posterior antennae is about as long as the two pre- 

 ceding ones, and terminates in a rather long slender spine. 



The maxillae resemble very closely those of Dyspontius striatus, Thorell. 

 The second pair of foot-jaws are rather powerfully clawed, and bear 

 each a single spine at the distal end and on the inner aspect of the second- 

 last joint. 



The outer margins of the joints of the outer branches of the swimming 

 feet are fringed with minute close-set spines, and the outer terminal 

 angles of the first and second joints are armed with one stout lancet- 

 shaped, and one small spine; the third joint has three such pairs of spines 

 on its outer edge, and terminates in a sabre-like spine which has its outer 

 edge finely serrate. The inner margins of these joints are clothed some- 

 what similar to those of A, magrdceps, Brady. 



The integument of the cephalothorax is thickly covered with small 

 conical papillae. 



This species has, like A. Normani, an elongated abdomen; the last 

 joint is dilated distally, and is rather shorter than the third, while the 

 second-last is shorter and narrower than either ; the caudal appendages 

 are stout and about as long as the last abdominal segment ; each bears 

 three setae, the inner one is short and slender, and the other two long, the 

 middle one being considerably the longest; on the outer edge of each 

 appendage, and about a fourth of its length from the free end, there is 

 inserted in a kind of notch a short plumose seta. Length, one-twentieth of 

 an inch (1*3 mm.). 



One specimen only of this form was obtained among material dredged 

 in the vicinity of Inchkeith. This solitary specimen was a female, and 

 does not agree with any species known to me. Dr G. S. Brady, F.R.S., 

 and Mr J. C. Thomson, F.L.S., to whom I submitted the specimen, have 

 also been unable to assign it to any described species. Mr Thomson, 

 who has recently been working very largely at Copepoda, both of British 

 and foreign seas, was at first of opinion that it is not impossible that it 

 may be found to belong to the genus Dyspontius ; but the differential 

 characters cannot be completely made out without dissection, and I do 

 not wish to destroy the specimen for that purpose. 



Professor Ewart has suggested that the species should be named A.papil- 

 latus, which has been adopted. 



I am indebted to Mr W. L. Calderwood for the drawings which 

 accompany this description. 



