125 



OVISACS. They are very large and somewhat oblong (fig. 3b); those I found were 

 a little flattened, the one drawn is - 74 mm. in length. Each of the ovisacs containing 

 numerous middle-sized eggs. 



LARVA. The only specimen found (fig. 3n) is - 22 mm. in length. Inside the base 

 of the antennula an oblique, somewhat geniculated, pretty considerable list. The antennulae 

 2-jointed, their terminal seta exceptionally long; the olfactory seta scarcely half the length 

 of the cephalothorax. The antennae somewhat shorter than the antennulae ; the second joint 

 of the same length or a little longer than the first one; third joint short, its terminal seta 

 about as long as the whole antenna. Of the maxillulae I have only been able to find a 

 single rather short branch on one side. The second joint of the maxillae proportionally long 

 and rather slender, the third joint comparatively short; the joints smooth. The abdomen 

 much as in S. paradoxa, however, the long setae of the first segment extend a little further 

 behind the caudal stylets, and the terminal setae of these stylets are scarcely half the length 

 of the body. 



POST-LARVAL DEVELOPMENT. A single pupa (fig. 31 and fig. 3m) has been 

 found and is mentioned above on p. 56. 



HABITAT. Argissa typica Boeck from the west-coast of Greenland. In the 

 marsupium of a female was found the large female represented and a male attached to it, 

 besides an unattached male, a larva and four ovisacs, two and two glued together, all 

 without larvae and not varying much in size. In an immature specimen without marsupium 

 was found the pupa represented; in another young specimen the recently hatched female 

 represented in fig. 3c and 3d; it was hinged to a gill by a rather broad, triangular (in 

 fig. 3d visible) adhesive plate, which on the gill expanded into a circular disk. 



REMARKS. The female presents very few peculiar characters, whereas the very 

 beautiful male is distinguished from kindred species by several characters. A lateral view 

 of the male, when placed under the microscope, so as to leave out the dorsal outline, pre- 

 senting only the part immediately above it, shows the peculiar aspect of the spaces beneath 

 the skin represented in fig. 3i. 



14. Sphaeronella Metopae n. sp. 



(PI. IV, fig. 4a; pl.V, fig. la -lg). 



FEMALE. The specimen represented in fig. la, which is the largest and best, is 

 •40 mm. in length and 33 mm. in breadth ; the head is tolerably large and well defined from 

 the sub-globular trunk ; probably the female can become somewhat larger. The frontal margin 

 is naked (fig. Id). The antennulae of about medium length, with rather short setaa. The 

 antennae good-sized, 3-joiuted; the basal joint short, the terminal seta about the length of 

 the last joint. The mouth-border of about medium breadth. The maxillulae with well 



