il. sp. PI. I. li'. 2—4; PI. X, fig. I </ I tl. 



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



ii short, rerga with the basal point obliquely truncated. Carina narrow, its keel 



ar the inferior extremity. Basis <>t' the carina truncated, indistinctly forked. Peduncle 



the length of the capitulum. X<> thicker spines in the notch "I the maxillae under the three 



upper stronger spine-, 



General appearance (PI. I. fig. 2 . Much like /'. Kaempferi Darwin but with ashorter 

 peduncle .nul .1 somewhat different carina. Valves 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 hein-- broader than in P. 



Basal margin and carinal margin together forming an almost continuous curved 



line. Interiorly th<' basal margin is furnished with a strong rim and a tooth at the occludent, 



basal corn< 



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

 . pointed. Delicately striated. 



I arina (PI. 1. fig. 3) extremely narrow, its width only slightly increasing towards the 

 base. lts base truncated. miniature evrescences at both sides representing the prongs of the 

 tork of other species (PI. 1. fig. 30). 



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

 Si ze. The largest specimen has a capitulum of 10.5 mm. length. 



Mouth: Labrum with about 28 small beaddike teeth placed at a little distance from 

 one another; Pal pi 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 <>f two or three together. 



Maxillae (PI. I, fig. \ 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 12 stronger as 

 well as -maller spines on the inferior. upraised part. Hairs on the surface of the maxilla not 

 ver) dense, in groups oi two or three. 



1 'uter 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. Firsl pair standing far from the second, with nearly equal rami: the one divided 

 in six, the other in seven segments, the first segment <>f both being indistinctly divided into 

 two. Surfai ach segment with a dense tuft i>( long hairs. 



ond cirrus about three times as Ion- as the fust; the longest (posterior) ramus 

 13, the anterior ramus 11 segments. 



Third cirrus with rami of 15 and 14 segments. Most segments are furnished on the 



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



v 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. 



6 



