REPORT ON THE CTRRIPEDIA. 89 



Carinal margin arched, upper margin irregularly hollowed out ; lateral and basal mai _ 

 straight and almost of the same length. 



Length of the eapitulum, G mm, 



The peduncle is short (about 2 nun.). The scales are placed in longitudinal rows, and 

 slightly prominent. 



I have not been able to study the animal contained in the eapitulum, nor have I 

 observed the complemental male of this species. 



This species was taken at Station 19G, October 13, 1874; hit, 0° 48' S., long. 120' 58' 

 E.; depth, 825 fathoms; bottom temperature, 2°"4 C; bottom, rink. 



Observations. — This is one of the cases in which it must seem rather hazardous to 

 propose a new species for a single specimen. However, I think it will prove possible to 

 recognise the form by the aid of the figure and of the description. 



Scalpellum nymphocola, n. sp. (PI. III. fig. 23 ; PI. IX. fig. G). 



Valves fourteen, smooth, covered by very thin membrane. Carina simply bowed, with 

 the umbo at the apex. Rostrum visible at the surface. Upper latus pentagonal. 

 Infra-median latus quadrangular. Peduncle almost as long as the eapitulum. 



Numerous specimens of this species were taken in 1880, by II. M. hired ship 

 " Knight Errant," They are also richly represented in the collections made during 

 the cruise of II.M.S. "Triton." In both cases they were found attached to the legs of 

 Nymphon robustum, Bell, a stout Pycnogonid which is common in the cold water area of 

 the Faroe Channel, and also in higher northern latitudes. In the Faroe Channel it 

 is a common occurrence to observe the parasite on the legs of this Pycnogonid, whereas 

 on the legs of true Arctic specimens the Scalpellum (hitherto at least and as far as my 

 knowledge goes) has never been observed. 



Capitulum thick, robust, oval shaped, the tergum slightly produced. Valves fourteen ; 

 covered by very thin membrane, and not presenting distinct lines of growth. Valves 

 separated by distinct and rather broad chitinous interspaces. Scutum and upper latus 

 short and broad, valves of the lower whorl rather large. 



Scutum quadrangular, not quite once and a half as long as broad, convex. Umbo at 

 the apex, which projects over the tergum. 



Tergum triangular, occludent margin arched and a great deal shorter than the scutal 

 margin. 



Carina simply bowed, with the roof fiat and the umbo situated at the apex. The 

 sides of the valve are well developed, and only slightly broader near the upper extremity 

 of the valve. 



Upper latus pentagonal; in full-grown specimens the tergal margin makes a right 

 angle with the scutal and also with the carinal margin. 



(ZOOL. CEJALL. EXP.— PART XXV. — 1883.) Iil> 12 



