1326 THE VOYAGE OF H.M.S. CHALLENGER. 



attached irregularly to the borders of the cornea. These appendages are hollow tubes 

 pointed and closed at the top, and flattened and slightly denticulated at the base. The 

 cornea of the eye is faceted externally, the facets being hexagonal (Plate L. fig. 7). 

 Beneath the facets we find very elegant slender crystalline bodies, - 840 rnillim. long, 

 and at the top 0"147 millirn. broad (Plate L. figs. 9, 9a). I have figured two pairs of 

 these, as they are always united together by their slender ends, the point of union being- 

 shown at fig. 9a. In then- upper part a granulation is to be seen, giving them a slightly 

 brownish colour ; and in their tapering extremities there are some clear vesicles, which 

 have some resemblance to the varicosities of a nerve-fibre. The nerve-ends which are 

 present in Phronima are absent in this form, and there is no pigment." 



In regard to the figures of the ocelli, it may be remarked that their tapering 

 extremities should have been drawn straight, not sinuous ; at least I believe that they 

 only assume the serpentine form when detached. The hinder margin of the eyes is 

 not straight, as implied in the above description and as figured in the Plate referred to, 

 but each eye has a curved hind margin, which leaves a small triangular space at the 

 back of the head dividing one eye from the other. 



Upper Antenna}. — Of these von Willemoes Suhm says, 1 — " At the frontal border, 

 separated by a distance of about 7 millims., there are two antennae 26 niillims. long. 

 The antenna? consist of two elements, of which the proximal is longer than the distal, 

 which is enlarged at the end, and bears a very small recurved claw." These antenna? 

 are therefore longer than the head, instead of shorter as in the male. Unfortunately 

 when the specimen came into my hands the ends of the antenna? were broken and the 

 tips were gone, but from the portions remaining I feel tolerably sure that the articulation 

 of these antenna? has been misinterpreted ; the first joint is short as in the male and 

 evidently represents the peduncle, the "recurved claw" is no doubt equivalent to the 

 little terminal joint in the male, while the elongated intermediate joint had, owing to 

 an accidental fracture, assumed the appearance of two joints, one "angulated" upon the 

 other. The appearance of jointing produced by fracture is not uncommon in the limbs 

 of animals belonging to this genus. 



Mouth Organs closely resembling those of the male. 



Mandibles. — The lowest tooth of the cutting edge is a little more drawn back on 

 the left mandible than in the male specimen ; the triangular process on the upper 

 margin of the trunk is more slender. 



First Maxilla}. — The distal spines of the outer plate are not in precisely the same 

 arrangement as in the male specimen ; thus, the two large spines nearest to the outer 

 group are cleft for more than half their length ; but the force of minute differences of 

 detail of this kind is destroyed by the fact already noticed, that in the maxillipeds of 

 the male specimen the two sides are unlike in just such details. 



1 Lvc. cit., p. 630. 



