TORTtTLOSA. 187 



270. Tortulosa rugosa, Fulton. 



Cataulus rugosa, Fiiltou, A. M. N. H. ser. 7, xiii, 1904, p. 4o2. 

 Cataulus rugosus, Sykes, Jouru. Malac. xii, 1905, p. 55. 



Original description: — ''Shell very iiaiTowly umbilicate, sub- 

 fusiform, modenitely solid, colour light yellowish bi'own, nucleus 

 smooth, sculptured below with somewhat nodulous oblique striae, 

 which give a malleated appearance to the shell; whorls 6|, 

 moderately couvex; basal carina moderately produced; aperture 

 circular, reddish brown within; peristome yellowish, continuous; 

 basal canal semicircular, situate at centre of basal portion of 

 the peristome. 



"Maj. diam. 5 ; alt. Wk mm." 



Hah. Cevlou. 



Fig. 27. — Tortulosa rugosa. 



•* Tliis form is nearest to C. mar</iiiatus, but is much smaller, 

 not so slender, and the suture is not margined." [Fulton.) 



Tho accompanying figures have been drawn from the type in 

 the British Museum. 



27 J. Tortulosa smitbi, Sykcs. 



Cataulus smithi, Sykes, Jomn. Malac xii, 1905, p. 56, text-tig. 1. 



Original description : — " Shell deeply rimate, solid, straw-yellow, 

 the protocouch a trifle darker, pyramidal, with the spire well 

 raised; the earlier whorls smooth, and the residue sculptured by 

 numerous, closely-set, fine longitudinal costidae; suture well 

 impressed ; whorls 8, plano-convex, the last being a little com- 

 pressed in front; umbilical region large, sculptured as the rest of 

 the shell ; the umbilical carina is large and distinct, with a second 

 smaller one within; lip white continuous, subcircular, slightly 

 projecting at the base, reflected, most noticeably so at the lower 

 outer margin, canal large. 



•' Alt. 26*5, diam. max. (of last whorl) 10-5 mm." 



Ilab. Ceylon. 



" As compared with C. aureus the present shell is straw-yellow 

 and not golden yellow in colour; it is much larger with flatter 

 \\ horls, the month is subcircular and lacks the angle at the upper 

 right hand margin, etc. Prom C. austenianus the shape and colour 

 of the mouth and lip, as also the elongate form, will suffice to 

 sever it: similar variations distinguish it from the white-lipped 

 var. of C. Juemastoina. 1 would lay stress on the second carina 

 at the base." {Sg/ces.) 



