6b NEW YORK STATE MUSEUM 



Klasmura clavigera sp. nov. 

 Plate 23, figures S and g 



The collection of starfishes secured by Mr D. D. Luther from 

 the West Hill flags (Gardeau beds of the Portage group) at Deyo 

 Basin, south of Naples, contains a ray and a fragment of another 

 that exhibit so striking characters that it is safe to describe their 

 species from them ; for, on one hand, the species can always easily 

 be recognized from the characters known at present, and on the 

 other, the rays expose their oral side so that the genus also can 

 be determined with certainty. 



This starfish was a small form. The ray which is fairly com- 

 plete is about 15 mm long and but 1 mm wide at the widest part, 

 and each column contains more than forty (about forty-two) 

 ossicles ; the ray is very slender, narrow at its base, then widening 

 gradually to twice its initial width at about one-third its length, 

 and then again tapering to the very slender 

 distal extremity. The ambulacrals are oppo- 

 site, short, boot-shaped with relatively short, 

 pointed " foot," or wing; the opposite ossicles 

 apparently closely united and separated by a 

 Fig 30 Klasmura vei T narrow ambulacral channel or furuow. 

 c! a v i g e r a nov. Di- They number thirty in io mm. The adambula- 

 agrammatic view of crals are in the more complete ray seen only in 

 portion of actinal side their outer projecting edges, while in the frag- 

 °\ J* ay ' VCn ra P a eS ment (see pi. 23, fig. 8) they are distinctly 

 recognizable as rather broad transverse plates, 

 which are opposite to the ambulacrals, and with them surround 

 the podial openings, situated between the distal portions of the 

 ossicles. The outer edges of the adambulacrals are distinctly ele- 

 vated; their margin is produced outward a little below the distal 

 transverse suture and there bears a long, strongly clavate forwardly 

 directed spine with saddle-shaped basis. 



The characters by which this form is most distinctly marked are 

 the boot-shaped form and opposite position of the ambulacral plates 

 and the corresponding opposite position of the adambulacrals or 

 side plates ; and finally the clavate shape of the spines. The form 

 and opposite arrangement of the ossicles suggest relationship to 

 Hallaster forbesi (Hall) , but the form of the side plates 

 with their saddle-shaped interlocked spines refers the species dis- 

 tinctly to Klasmura ; although we have seen neither the ventral 



