Howe : Phycological studies 89 



6. Neomekis Cokeki M. A. Howe, Hull. Torrey Club 31 : 97. 



f^/. 6. /. J-12. 1904; 32: 580. 1905. 



Plants solitary or ccspitosc, rarely widely gregarious, subcylin- 

 drical or clavate, 7-37 mm. long, 1.5-3 "i'"- thick, dark green in 

 upper third or fifth, becoming grayish white below, apex rounded- 

 obtuse or subtruncate, often exhibiting a delicate, translucent 

 apiculum formed of the mantle-caps : number of successive whorls 

 of branches mostly 60-175 I number of branches in a whorl 12- 

 56 : hairs of two forms in separate alternating zones, those of one 

 form consisting of a single, clavate, often curved or somewhat 

 hooked cell rich in chloroph)'! and having a maximum diameter 

 about equal to that of the supporting cell, the apex acute, obtuse, 

 or more often apiculate ; those of the second form consisting of a 

 somewhat similar thougii slightly narrower basal cell bearing at 

 its apex one or two earlier caducous, more slender branches, these 

 in turn each bearing 2-4 branches ; unicellular hairs and basal 

 cells of the multicellular persisting in the upper third or fifth of 

 the plant, the surface after their fall appearing somewhat shaggy 

 or minutely and irregularly punctate, a cortex being scarcely de- 

 veloped : branches of the first order lightly calcified, scarcely 

 coherent ; branches of the second order more strongly calcified, 

 irregularly and imperfectly coherent, subfusiform, often somewhat 

 curved or gibbous, broadest (loo-i 50/^) a little above the middle, 

 tapering to a conico-truncate apex 22-34 /i broad at the insertion 

 of the hair : sporangia strongly calcified, free or coherent in short 

 rows of 2-8, 1 80-260 /i long (decalcified and including stalk), 

 calcareous capsule 2 5-40 /i thick ; spores obovoid or oblong- 

 ellipsoidal, 140-190 /ix 82-94 /i. [Plate i, figure 6] 



Type locality : Opposite Current Town, Eleuthera, Bahamas. 



Distribution : Bahamas ; commonly under shelving rocks, 

 near low-water line. 



We now have this very peculiar species from fourteen stations, 

 all within the Bahamian archipelago. 



B, TWO WEST INDIAN SPECIES OF ACETABULUM =■= OF THE POLYPHYSA 



SECTION 



Acetabulum pusillum sp. nov. 



Plants minute, short-stalked, 1-3 mm. high, grayish green, 

 well calcified throughout but with especially heavy deposits of 



* In the Botanisk Tidsskrift 28 : 274, 275. 1908, Dr. F. Borgesen has remarked upon 

 the present writer's employment of the generic name Acetabulum instead of the more 

 usual Acetabularia, giving there the impression that the use of 1753 as the initial date 



