104 MR. G. C. CRICK ON THE MUSCULAR ATTACHMENT OF THE 



anterior border, an incised line, is 9'5 mm. in advance of that portion of the 

 lateral saddle of the last suture-line which is close to the umbilical margin ; it passes 

 thence outward and backward nearly parallel t6 the suture and almost as far back as 

 the last septum, when it appears to turn ovitward and pass over this portion of the 

 lateral saddle as a feebly-depressed rather than an incised line. This last-mentioned 

 portion of the boundary may have been produced by the anterior border of the annulus. 

 The greatest width of the portion of the impression that is visible is 5 mm., and it is 

 confined to the somewhat sloping inner area of the whorl. Its surface is a little 

 roughened, and the ira^^ression seems to have occupied the lol)e which is situated on the 

 inner area of the whorl. An irregular, waved, depressed line passes over the siphonal 

 lobe on eacli side of the body-chamber, and this most probably indicates the position of 

 a further jDortion of the anterior border of the annulus. 



P R I o N o T R o P I D .E, Zittel. 



ScHLCENBACHiA, Neumayr. 



Schloenhachia GoodhalU, J. Sowerby, sp. — The remains of the muscular attachment 

 are exhibited by an example of this species in the British Museum Collection (No. 46491). 

 The specimen is from the Greensand of Blackdown, Dorset. It consists of a segment of 

 two adjacent whorls, the outer of \\hich exhibits at about its mid-length the basal 

 l^ortion of the body-chamber, which on the left side is entirely denuded of the test. The 

 whorl is carinated, much compressed laterally, and its sides nearly parallel ; at the 

 base of the body-chamber it is 80 mm. high and 45 mm. wide or thick, the inner area 

 being concave, sloping towards the umbilicus, and 12 mm. wide. On the left side, on the 

 internal cast of the body-chamber, the anterior boundary of the muscular scar is seen 

 as an incised line arising at the suture of the shell at about 30 mm. in advance of the 

 corresponding portion of the last septum ; passing obliquely backward and outward 

 across the inner area, it crosses the umbilical margin at about 22 mm. in advance of the 

 corresponding part of the last septum ; it continues outward and backward for a short 

 distance, and then divides ; one part joasses backward and outward for a very short 

 distance and then disapjiears ; the other passes backward nearly parallel to, and at a 

 distance of 4 mm. from, the umbilical margin, and disappears shortly before reaching the 

 suture-line of the last septum. The branch which passes outward is probably the com- 

 mencement of the anterior border of the annulus, the other being the outer boundary of 

 the muscular scar. Arising from the suture of the shell, 13 mm. posterior to the line 

 already described, and crossing the inner area nearly parallel to the same line, there is 

 another very feeble groove, which scarcely crosses the umbilical margin before reaching 

 the last suture-line. Prom the appearance of the inner surface of the piece of the test 

 which fits on to this portion of the specimen, it seems most probable that this feeble groove 

 indicates the position of the posterior boundary of the muscular scar. The opposite 

 side of the whorl is too imperfect to exhibit any trace of the muscular attachment. 



