ASTROPIIYTON CARYI. 185 



smaller ; most of tlicm are clustorcd near the point of the mouth-angle. 

 Arms covered above and on the sides with fine j;-rains, which are 

 ur()U})ed near tlie ])a<e of the arm in incL^iilar Ncrtical ri(l<^es ; these 

 ridges become more regular and distinct towards the end of the arm, 

 and on the smaller branches take the form of a double vertical row of 

 grains ; along the middle line of the arm runs a very obscure narrow 

 funow, in which the grains are rather more scattered. Under side of 

 the arms covered with a smooth skin, beset with fine, scattered, smooth 

 grains ; the joints are indicated by very faint cross lines. Tnterbrachial 

 s])aces above, and brachial spaces between the ra(nal ribs, spi-inkled 

 with a few line grains, like those of the arms, but coarser. The npper 

 and lower surfaces are separated by a raised edge, which is slightly 

 granulated. Radial ribs extending quite to the centre, closely beset 

 with coarse, rounded grains; length to breadth, 17:5. Interbrachial 

 spaces below covered with a very smooth skin, which is sprinkled with 

 fine rounded grains. Genital slits bordered on the side next the inter- 

 brachial space by rows of fine grains. The granulation of the interbra- 

 chial space extends to the base of the mouth-angle. Arm-spines all 

 hooked, microscopic, the lowest one largest, arranged in two vertical 

 rows ; they are abundant on the end twigs, but are not found on the 

 main trunks within the seventh fork from the disk. Tentacle-scales 

 three, sometimes four, and within the disk connnonly two ; spiniform, 

 like the teeth, but blunter ; they extend within the inner end of the 

 interbrachial space. Color, in alcohol : above, light vandyke-ljrown ; 

 interbrachial spaces darker ; below, under surface of arm nearl\- white ; 

 interl)rachial spaces same as above. 



A single sjiecimen has been sent from San Francisco by Mr. T. G. 

 Gary, to the Museum of Comparative Zoology. 



A.stro2)hyton Caryl is distinguished from A. eucnemis, which it re- 

 sembles, by more regular granulation of the disk, by having blunter 

 tentacle-scales, and by close rows of grains along the edge of the 

 genital slits. 



LIST OF SPECIMENS. 



24 



