8 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VoL. 13, No. 1 
puberulent or glabrate, the lateral nerves inconspicuous; cymes lateral, dense 
few-flowered, the peduncles very slender, 2.5-3.5 em. long, pilosulous with 
whitish subappressed hairs; flowers sessile or subsessile, ebracteolate, ob- 
scurely or‘not at all secund; hypanthium and calyx cylindric, 2-2.5 ‘mm. 
long, appressed-pilosulous, the lobes minute, obtuse; corolla densely ap- 
pressed-pilosulous outside, the slender tube 15 mm. long, the lobes oblong- 
ovate, obtuse, 2.5 mm. long; anthers semiexserted; fruit white, 2-celled 
oblong, glabrate, 1-1.5 em. long. 
_Type in the U. 8. National Herbarium, no. 1,110,841, collected in the 
vicinity of Chacahua, Distrito de Juquila, Oaxaca, Mexico, altitude 5 meters 
Dec. 17, 1921, by C. Conzatti (no. 4475). 
Related to C. microloba Donn. Smith, of Costa Rica, which differs in its 
small flowers and scant pubescence. 
ZOOLOGY.—A revision of the recent representatives of the crinoid family 
Pentacrinide, with the diagnoses of two new genera... Austin H. 
Ciark, National Museum. 
A detailed study of the recent representatives of the crinoid family 
Pentacrinide shows that these are by no means so closely allied to 
the fossil species in the same family as has been supposed. None of | 
them can be considered as congeneric with [socrinus pendulus with 
which most of them have been associated, and their relationships 
with other fossil types are still more remote. 
The following disposition of the living forms is suggested. 
KEY TO THE RECENT GENERA OF PENTACRINIDA 
a! Second post-radial ossicle not an axillary 
b! fourth post-radial ossicle an axillary 
Saracrinus 
b? first axillary beyond the fourth post-radial ossicle 
Metacrinus 
a? Second post-radial ossicle an axillary from which two arm trunks arise 
b! elements of the [Br series (the first two post-radial ossicles) united 
by syzygy 
c' at least the outer division series of more than 6 elements; proxi- 
mal pinnules with a strongly serrate profile i 
Cenocrinus 
c? none of the division series of more than 4 elements; proximal 
pinnules with a smooth profile 
d' division series beyond the first entirely, or at least mostly, 
of more than 2 elements 
e! division series beyond the first variable, but never 
3(1+2); distal edges of the post-radial ossicles 
everted and produced 
Teliocrinus 
e? all the division series beyond the first 3(1+2); distal 
edges of the post-radial ossicles not produced 
Endoxocrinus 
1 Received December 6, 1922. 
