682 



such case the specific name proposed by that author ought to be retained as 

 the much older one. 



Occurrence. — Only a single specimen of this form was taken last 

 Slimmer in the Christianiafjord, at Soon, from a depth of about oO fatlioms. 



T)istn'hnfifln. — Kattegat (Meinert.V Shetland Isles (Norman). 



Page 62. Orchomene serratus. 



(Suppl. PI. IV, fig. 1). 



The male of this species, and perhaps also that of 0. crisjwins and 

 0. j;«////ai/(5, is markedly distinguished from the males of 0- Ba/ei and 0. am- 

 hh/ops by the far less pronounced sexual difference, and in order to show this, 

 I have thought it right on the accompanying plate to give a habitus figure of 

 the adult male of the present species together with some anatomical details. 

 On comparing these figures with the ones given on PI. 23 which represent 

 the female, it will be seen, that the male is of far inferior size, scarcely 

 exceeding a length of 6 mm., and exhibits on the whole a comparatively 

 shorter and stouter form, with the cephalon considerabh' larger in pro- 

 portion to the rest of the body. The lateral corners of the cephalon 

 are rather prominent, biit do not otherwise differ in their form from 

 those in the female. ') The eyes, on the other hand, are of comparatively 

 larger size, and less narrowed in tlieir upper part. The superior antennse 

 appear considerably thicker and more massive, the 1st articulation of the 

 llagellum in particular being very large, and exhibiting a dense supply of long, 

 diverging olfactory cilia. The inferior antennae, unlike what is the case in 

 <). Batri and 0. nmhliinps, ap]iear at first sight of the very same structure as 

 in the female. On a closer examination, however, the llagellum is found, 

 in I'eality, to be a little longer, and composed of a greater number of 

 articulations, viz., 8 instead of, as in the female, only 6, and the 3 first of 

 these articulations are each provided anteriorly with a well-developed cal- 

 ceola, wholly wanting in the female. The last pair of uropoda do not differ 

 in any manner fmm tliose in the female. 



Page G4. Orchomene pectinata. 



Distrihntion. — The Kara Sea (Hansen). 



') Tlic fig. ].G(jC on V\. 23, at the riglit side, does not helons; to the present species, Ijnt to 

 O. nmhlyopn. 



