482 ME. p, w. BASSETT-SMiin ON [Apr. 18, 



tinctly segmented. Genital ring short. Abdomen small, with two 

 minute caudal plates. Posterior antenna; strongly uncinate. All 

 four pairs of thoracic limbs present, biraniose and triarticulate. 



(1) Theeodajius sereani. 5 . 



Therodamus serrani Kr. Bidrag til Kundskab, 18(33, p. 316, 

 pi. XV. fig. 4. 



Host : gills of Serranus sp. West Indies. 



G. 3. Peniculits Nordm. 



Head oval, without horn-like processes. Thorax distinctly seg- 

 mented, giving rise to four pairs of limbs, the first two pairs being 

 placed close behind the head, the third and fourth some distance 

 removed from them and from each other. Genital segment very 

 long. Abdomen small, with minute caudal plates. 



Male smaller than female, with a short genital segment. 



(1) Penioulus fistula. 2 6 . 



Peniculus fistula Nordm. MLkrog. Beitrage, 1832, p. 107, pi. vi. 

 fig. 8. 



M.-E. Hist. Nat. Crust, iii. 1840, p. 497. 

 Heller, Eeise d. Novara, 1865, p. 248, pi. xxv. 



»> 



fig. 3. 



„ „ Claus, Eech. iiber Lei-naocera &c, 1868, p. 12, 



pis. ii., iii 

 Host : Zeus faher. 



(2) PeNICFLUS ETJECATirS. $ . 



Peniculus furcahis Kr. Bidrag til Kundskab, 1863, p. 268, 

 pi. xii. fig. 4. 

 „ „ Claus, op. cit. 1868, p. 12. 



Host : gills of Holacanthus [Tetrodon] sp. East Indies. 



(3) Peniculus clavatus. $ . 



Peniculus clavatus Kr. Bidrag til Kundskab, 1863, p. 266, pi. xiv. 

 fig. 8. 



Lerncea clavata Miill. 



Host : fins of Sebastes norvegicus. Greenland. 



G. 4. Penella Oken. {Lemceojnnna Blainv.) 



Head large, globose, tuberculate, with arm-like projections directed 

 backwards ; the neck is long and straight, not distinctly segmented, 

 united with the elongated genital segment in the same hne. 

 Abdomen penniform. I'our pairs of limbs are present, placed close 

 behind the head and together ; the first two are biramose, the third 

 and fourth uniramose, each brauch with two joints. 



Male minute, not elongated. 



Young form of female as " Uessella cyhndrica " Brady, Chall. Eep. 

 vol. xxiii. p. 190, pi. xxix. figs. 40-42, and Baculus elongattis, 



