3- Poecilasma diidhiiu n. sp. PI. I, fig". 2 — 4; PI. X, fig. la — id. 



Capitulum distinctly swollen about the middle, compressed towards the apex. Scuta oval, 

 basal margin short. Terga with the basal point obliquely truncated. Carina narrow, its keel 

 flattened near the inferior extremity. Basis of the carina truncated, indistinctly forked. Peduncle 

 '/a the length of the capitulum. No thicker spines in the notch of the maxillae under the three 

 upper stronger spines. 



General appearance (PI. I, fig. 2). Much like P. Kaempferi Darwin but with a shorter 

 peduncle and a somewhat different carina. \"alves quite white, the scutum distinctly striated. 



Scutum distinctly striated. Apex pointed, a distinct ridge runs from the apex to 

 the umbo, the part between this ridge and the occludent margin being broader than in P. 

 Kaempferi. Basal margin and carinal margin together forming an almost continuous curved 

 line. Interiorl}- the basal margin is furnished with a strong rim and a tooth at the occludent, 

 basal corner. 



Tergum small in proportion to the scutum with the basal end obliquely truncated, 

 apex pointed. Delicately striated. 



Carina (PI. I, fig. 3) e.xtremely narrow, its width only slightly increasing towards the 

 base. Its base truncated, miniature excrescences at both sides representing the prongs of the 

 fork of other species (PI. I, fig. 3a). 



Peduncle cylindrical, short, less than one third the length of the capitulum, distinctly ringed. 



Size. The largest specimen has a capitulum of 10,5 mm. length. 



]\Iouth: Labrum with about 28 small bead-like teeth placed at a little distance from 

 one another ; Palpi with rather numerous, slender, not very long hairs. 



Mandibles with four teeth and the inferior angle bifid ; most of the hairs on the 

 surface are placed in little groups of two or three together. 



Maxillae (PI. I, fig. 4) with three stronger spines above the notch, a very short spine 

 near the third of these three at the beginning of the notch, no spines in the notch and four 

 short and slender ones at the other slope of the notch ; a number of about 1 2 stronger as 

 well as smaller spines on the inferior, upraised part. Hairs on the surface of the maxilla not 

 very dense, in groups of two or three. 



Outer maxillae almost quadrangular, with the outer edge rounded; the surface and 

 the outer margin with numerous hairs, those of the margin curved for the most part. 



Cirri. First pair standing far from the second, with nearly equal rami: the one divided 

 in .six, the other in seven segments, the first segment of both being indistinctly divided into 

 two. Surface of each segfment with a dense tuft of long^ hairs. 



Second cirrus about three times as long as the first ; the longest (posterior) ramus 

 has 13, the anterior ramus 11 segments. 



Third cirrus with rami of 1 5 and 1 4 segments. Most segments are furnished on the 

 inner side with four pairs of spines : the first and the second pair very long, the third shorter, 

 the fourth very short and delicate, nearly rudimentary; sometimes a fifth pair of extremely 

 delicate hairs is present ; as a rule a slender spine is implanted between the two of each pair. 



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