2358 CLASS VII. 
Sp. Cheetopterus pergamentaceus Cuv., MILNE Epwarps Ann. des Sc. nat. Tom. 
xxx. Pl. 22, fig. 1, Cuv. R. Ani. éd. ill., Annél. Pl. 20, fig. 2 ; in the West 
Indian Sea. A species of this genus occurs also in the Mediterranean. 
Family IX. Pertpatina. The rudiments of feet are conical 
tubercles, supplied with a fasciculus of thinly set setee at the point. 
Head distinct, provided with two cirri (antenne) annulate, large, a 
short proboscis, and two jaws. 
Peripatus LANspown GurLpinc. Body with few segments 
subdivided by annulate folds, obtuse at both extremities, gibbous 
above, plane beneath. 
Sp. Peripatus iuliformis LANspowN GUILDING, Zool. Journal, 11. Pl. xiv. 
fig. 1; Aupovin and Mine Epw. Ann. des Sc. nat. Tom. XXX. pp. 412— 
414, Pl. 22, figs. s—7; West Indies. This animal would seem, according 
to some, to be a myriapod insect ; the English author who first made it 
known, considered it to be a mollusc. Minne Epwarps, on anatomical 
grounds, defends its reception into this class ; Ann. des Se. nat. sec. Sér. 
xvi. Zoology. pp. 126—128. Branchie are not present, if the conical 
rudiments of feet are not to be considered as respiratory organs. 
Family X. Aricie. Body cylindrical, attenuated at both ex- 
tremities, with head little distinct. Proboscis short, without jaws. 
Rudiments of feet with cirrus usually single; branchie either none 
distinct or resembling cirri or lobes adhering to the base of the feet. 
This small group, regarded by Aupouin and Minne Epwarps as 
a distinct family, contains imperfect ringed worms, which in part 
belong to the Nereids of former writers. Where no special gills are 
present, the cirri appear to serve for respiration. 
Cirratulus LAM. Body elongate, round, with few dorsal and 
ventral sete remote, and long dorsal cirri. The branchiz very long 
cirri in the anterior part of the body. 
Sp. Cirratulus borealis, Lumbricus cirratus Muruu., O, Fapricit Fauna 
grenl. pp. 281—283, fig. 5, Encyclop. méth., Vers. Pl. 34, figs. 1o—12 ; 
Cirrat. Lamarckiti Aup. and Epw. Ann. des Sc. nat. xxv. Pl. Xv. figs. 
I—4, XXIX. pp. 410, 411; GRUBE Avemenwiirmer, 1838, pp. 32, 33- 
Ammotrypana RATHKE (Beitr. 2. Fauna Norweg.) A genus 
related to the preceding: it differs by defect of the long cirri (bran- 
chiz) in the anterior part of the body. 
Sp. Ammotrypana aulogaster RATHKE, 1. 1. p. 188, Tab. xX. figs. 1—3, &e. 
Ophelia Sav. Comp. Epw. and Aup. Ann. des Sc. nat. XXIX, 
pp- 40983—407. According to Sars the animal is so described that 
