425 



clustered near the point of the mouth-angle. Arms covered 

 above and on the sides with fine grains, which are grouped near 

 the base of the arm in irregular, vertical ridges ; these ridges 

 become more regular and distinct toward 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 ob- 

 scure, narrow furrow, in which the grains are rather more scat- 

 tered. 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. Interbrachial spaces above, and brachial 

 spaces between the radial ribs, sprinkled with a few fine grains, 

 like those of the arms, but coarser. The upper and lower sur- 

 faces 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 interbrachial space, by rows of fine grains. The granu- 

 lation of the interbrachial space extends to the base of the mouth- 

 angle. Arm-spines 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 disc. Tentacle-scales three, sometimes four, and, 

 within the disc commonly two; spiniform like the teeth, but 

 blunter ; they extend within the inner end of the interbrachial 

 space. Color, in alcohol, above, light Vandyke brown ; inter- 

 brachial spaces darker ; below, under surface of arm nearly white ; 

 interbrachial spaces same as above. A single specimen has 

 been sent from San Francisco by Mr T. G. Gary to the Museum 

 of Comparative Zoology. 



Astrophyton Caryi is distinguished from A. eucnemis, which it 

 resembles, by more regular granulation of the disc, by having 

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

 edge of the genital slits. 



Mr. Norman Easton, of Fall River, was chosen a Cor- 

 responding Member of the Society, and Messrs. Rice, 

 Edward Pickering, Richard C. Greenleaf, and Wm. Eliot 

 Lamb, all of Boston, Resident Members. 



