101 



with Ianira, and it is therefore somewhat questionable, whether it can in reality 

 be maintained. As, however, there are at least 3 species, which closely agree in 

 the distinguishing characters recorded by Dr. Bovallius for his genus, I am un- 

 willing at present to reject it. 



Ianthe laeiniata, G. 0. Sars. 



(PI. XLI.) 



Ianira laeiniata, G. 0. Sars, Bidrag til Kundskaben om Dyrelivet paa vore Havbankev, 

 Chv. Vid. Selsk. Forh 1872, p. 92. 



Specific Characters. — Body much flattened, oval in form, being scarcely 

 twice as long as it is broad. Cephalon provided with a long, spiniform, somewhat 

 upturned rostrum, lateral parts each produced to a strong lanceolate lappet point- 

 ing obliquely anteriorly. Segments of mesosome with the lateral parts laminarly 

 expanded, and each produced into 2 lanceolate lappets separated by a deep incision, 

 those of the 4 anterior segments subequal, those of the 3 posterior ones rather 

 unequal, the anterior lappet being much the larger. Caudal segment much broader 

 than it is long, gradually widening behind, and produced at the end, on each 

 side, to an acute triangular expansion, median prominence blunted, all the lappets 

 finely serrated at the edges, and, like the dorsal face, clothed with scattered hairs. 

 Eyes comparatively small, rounded. Superior antenna? reaching somewhat beyond 

 the penultimate peduncular joint of the inferior ones, flagellum about twice the 

 length of the peduncle, and composed of 20 — 30 articulations. Inferior antennae, 

 scarcely longer than the body, squamiform appendage of the peduncle distinctly 

 developed, flagellum not quite twice as long as the peduncle. Legs almost exactly 

 as in Ianira maculosa, except that one of the dactylar unguiculi is much smaller 

 than the other 2, and somewhat remote from the tip of the dactylus. Middle 

 piece of male operculum very slightly expanded at the end, which is irregularly 

 serrulated, with a small hamiform projection on each side. Uropoda fully as long 

 as the caudal segment, and densely clothed with spiniform bristles, inner ramus 

 scarcely as long as the basal part, outer ramus a little shorter, both being narrow 

 linear in form. Colour pale yellowish white, semipellucid, without any pigmentary 

 ornament. Length of adult male 8 mm. 



Remarks. — This form was first recorded by the present author in 1872 

 as Ianira laeiniata. It is nearly allied to the North American species, I. spinosa 

 Harger, but differs in the greater development of the lateral lacinise, as also in 

 the shape of the caudal segment. 



Occurrence. — I first met with this pretty form outside the Storeggen bank, 

 where 2 specimens were brought up in the dredge from the considerable depth 



