1903.] ox THE MARINE FAUNA OF ZANZIBAR. 129 



five upper labials, second and third entering the eye ; three lower 

 labials in contact with the anterior chin-shields, which are larger 

 than the posterior. Scales in 15 rows. Venti'als 261 ; anal 

 entire; subcaudals 25 pairs; tail ending in a compressed, obtusely 

 pointed scute, which is obtusely keeled above. Blackish bi-own 

 above ; traces of a yellowish nuchal collar ; upper lip white ; two 

 outer rows of scales white, each sc;^le with a blackish central spot ; 

 venti'als and subcaudals white, with a black spot on each side, 

 some of the ventiuls with an interrupted blackish border. 



Total length 610 millim. ; tail 40. 



A single female specimen from Dinawa, Owen Stanley Range, 

 4000 feet, collected by Mr. A. E. Pratt. 



The genus Toxicoccdanitcs was established by me in 1896 (Ann. 

 &, Mag. N. H. [6] xviii. p. 152), for a Snake from Woodlark 

 Island, British New Guinea, T. longisswucs, here figured 

 (PI. XIII. fig. 2), which differs from the one now described in 

 the numbers of scales and shields (Sc. 17; V. 299-305; A. 2; 

 0. 30-31), in the smaller eye, in the shorter internasals and 

 frontal, in the proportions of the upper labials, of which the 

 third and fourth enter the eye, and in the coloration. 



EXPLANATION OF THE PLATES. 

 Plate XII. 



Fig. 1. Xij/gosoma milnense, p. 125, male, natural size. 



2. Xrygosoma (jranulatum, p. 126, natural size. 



2 a. „ „ Upper view of head, X 2. 



3. Lygosoma pulchriim, p. 127, natural size. 



3 a. „ „ Upper view of head, X 2j. 



Plate XIII. 



Fig. 1. Xiygosoma pratti, p. 128. 



Figs. 2, 2 a, 2 h. Toxicocalamus longissimus, p. 128. Upper, side, and lower views 

 of head and anterior part of body. 

 3, 3 a, 3 h. Toxicocalamus stanlei/anus, p. 129. Upper, side, and lower views 

 of head and anterior part of body. 

 All natural size. 



4. On the Marine Fauna of Zanzibar and British East Africa, 

 from Collections made by Cyril Crossland in the Years 

 1901 and 1902.— Polychajta. Part II. By Cyril 

 Ceossland, B.A., B.Sc* 



[Keceived May 25, 1903. J 



(Plates XIY. & XY.t, and Text-figures 12-15.) 



Part II. — T he EuNiciDiE. 



Before beginning my examination of the typical Xereidiform 

 {i. e. Errant) Polychsetes, I investigated to some extent the 

 variability of those characters usually employed for specific 



* Communicated by Prof. W. C. McIntosh, F.R.S., C.M.Z.S. 

 t For explanation of the Plates, see p. 144. 



Proc. Zool. Soc— 1903, Vol. II. No. IX. 9 



