288 CHiETODERMA-NEOMENIIDJE. 



Zeitschr. wiss. Zool., xxxiii, p. 568, f. 2 (1877).— Wiren, Histolo- 

 giska meddelaudeu om Chajtoderma nitidulura Loven, in Biologiska 

 Foreningeus Forhandlinger, Stockholm, iii, pp. 37-49 (1890); 

 Mittheilungen iiber den Bau des Chfetoderma nitidulura Loven, 1. 

 c. ii, No. 7, pp. 68-73; Monographie des Cba^toderma nitidulura 

 Loven, in Kongl. Svenska Vet. Akad. Haudl., xxiv, No. 12, pp. 

 1-66, pi. 1-7 (1892).— SiMROTH in Bronn, p. 226, pi. 1, f. 1-13.— 

 Verrill, Explorations of Casco Bay, in Proc. Amer. Asso. Adv. 

 Sci. xxii, 1873, p. 347, pi. 6, f. 6. — Crystallophryssou niteus MoBius, 

 Jahresber. der Commission zur wissensch. Unters. der deutschen 

 Meere in Kiel, ii, iii, Zool. Ergebnisse 5, Vermes, p. 157, pi. 3, f. 

 6-12(1875). 



Verrill reports this species as common in 10 to 100 fathoras, 

 muddy bottom, off northern New England and Nova Scotia. 



C. MiLiTARE Selenka. PL 40, figs. 12, 16, 17, 18. 



The calcareous spicules of the proboscis are in the neighborhood 

 of the mouth (fig. 16) fiat and elliptical; further back they are 

 larger and have the form of shovel-like or tongue-like plates (figs. 

 17,), and finally they gradually become smaller again and take 

 the form of keeled spear-like points. The body proper bears only a 

 few thinly scattered rounded calcareous plates, but at the posterior 

 end there are again large plates, which towards the anus become 

 long stout prickles, with a cross-section between circular and ellip- 

 tical. Round about the anus are numerous small prickle like or 

 awl-shajjed calcareous needles (fig. 12). 



East of Paiiay, Philippines, Lat. 0°, 2G' N., Long. 123° Jf5' E., 

 375 fras. in blue mud. 



Chcetoderma militare Selenka, Chall. Rep., Vol. xiii. Report on 

 the Gephyrea, p. 23, pi. 4, f. 28-32. — Simroth in Bronn, pi. 1, f. 

 14, 15. 



Fig. 18 shows the animal natural size. Description and figures 

 from Selenka. 



Family KEOMENIID^. 



Body bilaterally symmetrical. Head and cloaca not defined from 

 the body, or but slightly so. Mouth subterminal on the ventral 

 side when the animal is at rest, the cloaca-opening similarly situated 

 or terminal. Ventral groove provided with a foot-ridge, or at least 

 a longitudinal strip desitute of cuticle ; foot-gland present. Gills 



