164 THE AMEHICAN MONTHLY [May 



Staurococcura clavigera, n. sp. 

 Phacoid shell a little more than twice as broad as the 

 outer and four times as broad as the inner medullary shell, 

 with spongy surface, pores indistinct. Arms club-shaped, 

 not quite as long as the diameter of the phacoid shell, 

 with short pyramidal terminal spine at the distal end, 

 all spines of same length, two of them in one axis being 

 offthe middle of the ends of the arms on opposite sides. 



Patagium incomplete, enveloping only a small portion of 

 the arms, with two rectilinear parallel rows of chambers. 



Dimensions'. — Diameter of the placoid shell 0.135, of 

 the outer medullary shell 0.06, of the inner 0.03; length 

 of the arms 0.12, basal breadth 0.04, distal breadth 0.075. 



Habitat: — Fossil in the rocks of Barbados. 



Note: — The name of the species of Staurococcura de- 

 scribed on p. 96 of the March number of the Journal 

 should read quaternaria not quarternaria as three 

 printed. 



Microscopic Fixing Solution. — Zenker recommends 

 (Munch, med. Woch.) the following- fixing- material for 

 vegetable tissue; it penetrates the tissue readily without 

 producing- any shrinking-: Distilled water, 100 parts; 

 mercuric chloride, 5 parts; bichromate of potassium, 2.5 

 parts; sulphate of sodium, 1 part; glacial acetic acid, 5 parts. 

 — Druggist's Circular. 



