J. M. Clarke — Clymenia in Western New York. 59 



trum characterizing maturity. The body-chamber is covered 

 with fine, elevated, falciform striae which make a broad retral 

 curve in crossing the latera, are bent forward sharply along a 

 low depression just within the ventrum ; along the low exter- 

 nal carinas they are again bent backward forming a series of 

 iilose festoons on the ventrum itself. On the early whorls 

 these lines are not apparent ; there the ornamentation consists 

 of a series of lamellar spinous processes occurring at regularly 

 increasing intervals. These originate on the median and. outer 

 portions of each whorl and are projected against the inner 

 edge of the succeeding whorl. They present a concave face 

 anteriorly and are, when entire, considerably extended at 

 right angles to the axis of the shell. These varices appear on 

 the first half of the third volution and from this point on, in 

 a selected example, nine may be counted for the next volu- 

 tion ; the whole number exhibited by the specimen to the last 

 contact with the body whorl being seventeen. On the exposed 

 whorl no further trace of the processes is observable than a 

 tendency on the earlier half of the volution to the formation 

 of pilae or a bunching of the striae. 



The sipho. — The dorsal or internal position of the sipho has 

 been observed in several instances. The siphonal funnel is 

 long,' conspicuously developed, and open along its inner surface. 

 It does not appear to have extended across the air-chamber, as 

 in the Nothoclymenice and I have seen no evidence of a true 

 siphonal tube connecting these funnels.* 



The suture's. — At maturity the septum is concave medially, 

 convex at the sides. There is no ventral saddle ; the ventral 

 lobe is broad, about equal in width to, but less acute than the 

 ventrolateral saddle ; the lateral lobe is narrower and there is 

 a small, but well developed dorso-lateral saddle. On the 

 internal edge of the septum there is an acutely angled external 

 lobe and an elongate, narrow saddle from which the suture is 

 continued into the siphonal funnel. Of the immature suture 

 but a single example has been observed ; at the end of the 

 second revolution the ventral lobe is comparatively narrow, 

 the ventro-lateral saddle very broad, neither the lateral lobe 

 nor dorso lateral saddle is developed, the lateral saddle being 

 continued directly into the external lobe of the internal mar- 

 gin. It is, thus, evident that the accessory lobe and saddle of 

 maturity are developed at a later stage of growth from the 

 broad lateral saddle. 



* Hyatt compares this arrangement of the siphonal funnels in G-umbel's group 

 of the Euclymenice, to which our species belongs, to the "imperfect siphons which 

 occur not infrequently among the Nautiloids. the connective wall being destroyed 

 by maceration." Proc. Boston Soc. Nat. Hist., vol. xxii, p. 313. 



