236 



Gen. 2. CryptOtMr, Dana, 1852. 



Syn. : Cryptothiria, Sp. Bate (part). 

 „ Hemioniscus, Bucliholz. 



Generic Characters. — Body of adult female forming a broad, lobular sac, 

 apparently without any distinct segmentation, but exhibiting- in front, somewhat 

 dorsally, a small conical projection, constituting the anterior larval part of the 

 body still retaining its appendages, and serving for the attachment of the parasite. 

 Young female Praniza-like, with the middle segments strongly tumefied. Male (and 

 last larval stage of female) slender, with distinct, though small eyes, basal expan- 

 sion of antennulse spatulate, and coarsely dentate behind. Parasitic in the mantle- 

 cavity of barnacles. 



Remarks. — This genus was established by Dana in the year 1852, to in- 

 clude a small parasite, C. minutum, found off the Fiji Islands in the corallido- 

 mous barnacle Creusia. In I860, Sp. Bate recorded, under the name of Liriope 

 balani, another form, which is undoubtedly congeneric with Dana's species, and 

 which also in the History of British sessile-eyed Crustacea was referred to that 

 genus (here spelt Cryptothiria); in the same genus was, moreover, included 

 a rather different form, viz., the Liriope pygmwa of Rathke, which constitutes the 

 type of a distinct and rather anomalous genus. The species of Sp. Bate was 

 subsequently, in the year 1866, rather fully described by Dr. Buchholz as the 

 type of a new genus, Hemioniscus, which name, however, must cede to that pro- 

 posed by Dana. To the Norwegian fauna there belongs only a single species, 

 to be described below. 



Cryptothir balani, Sp. Bate. 



(PI. XCVIH, fig. 2). 

 Liriope balani, Sp. Bate, Brit. Assoc. Report 1860, p. 225. 

 Syn. : Hemioniscus balani, Buchholz. 



„ Cryptothiria balani, Sp. Bate & Westwood. 



Specific Characters. — Body of adult female short and broad, star-like, with 

 7 radiating lobes, the 2 anterior of which are less prominent, sometimes ob- 

 solete, posterior lobe more conical than the others. Anterior larval part of the 

 body sharply defined, and consisting of the head and 3 anterior segments of meso- 

 some, with their appendages exactly as in the larva in its last stage. The latter 

 (and the male) oblong fusiform in shape, with the basal expansion of the anten- 

 nulse very broad, and divided into 7 or 8 strong teeth. Colour of adult female, 



