SCALPELLUM 239 



Number of segmefits of the cirri 



11 III IV V VI ^='"'1^1 



appendage 



Holotype 6 11 13 14 14 15 15 17 16 17 17 18 i 



Paratype 6 11 1317 — 15 — — — — — — i 



Cirrus I with rami of different lengths. Cirrus II also with unequal rami, shorter than 

 the following cirri, in which the rami are equal. Cirrus VI with six pairs of spines on 

 the front edge of the segments. 



The caudal appendage is single-jointed, broad and flat and covered with many 

 bristles. The appendage is of the same length as the proximal segment of cirrus VI. 

 In the paratype it is even shorter (Fig. 6,/). 



The complemental male could not be studied here. Probably it is of the reduced sack- 

 like type. 



Scalpellum angulare, n.sp. 



St. 170. 23. ii. 27. Off Cape Bowles, Clarence Island. 61° 25' 30" S, 53° 46' 00" W. 342 m., r. 

 Gear DLH. Young and old individuals situated on a Tunicate. 



Holotype. Zoological Department of the British Museum. 



Diagnosis. Female. Capitulum with fourteen plates and very small interspaces. 

 Growth lines well marked. Surface with strongly curved hairs. Scutum quadrangular, 

 occludent margin straight. Tergum large, triangular. Carina regularly bent, umbo 

 apical; dorsal roof somewhat concave. Upper latus pentagonal; umbo apical. Rostrum 

 triangular with the umbo apical. Rostral latus high. Inframedian latus with a triangular 

 primary part and a secondary upper part, both forming an obtuse angle seen from 

 the side. Umbo apical at first, but later sub-apical. Carinal latus pentagonal; umbo 

 projecting much beyond the carina. Peduncle with transversely elongated scales 

 and curved hairs. Mandible with three teeth and a small pectinated inner angle. 

 Maxilla I with a notch. Maxilla II with the bristles in two groups. Caudal 

 appendage single-jointed without bristles, shorter than the proximal segment of the 

 protopodite. 



Complemental male sack-like, without cirri and valves. 



Discussion and Description. These individuals represent a new and distinct species 

 of Scalpellum, well distinguished from other species by the very peculiar inframedian 

 latus. Even when fully grown the species does not seem to attain a large size. Of the known 

 species of Scalpellum, in my opinion the following are most closely related to this species : 

 S. brevecarinatum, Hoek, 1883, S. micrum, Pilsbry, 1907. I have named this new species 

 S. angulare from the curious, angularly bent inframedian latus. 



Two young stages were found in this material. They are figured here. T\i& first stage 

 (Fig. 7,/) has all plates of the capitulum well developed. The peduncle has the first four 

 basi-dorsal plates formed. The lower latera are different from those in the fully grown 

 specimen. They have not reached the height of the mature stage. 



