THE ASCIDIANS 253 



Digestive apparatus. — Enteric loop as a whole rather long (twice 

 as long as branchial sac in most of the zooids with latter somewhat 

 contracted) , narrow, straight ; esophagus rather longer than stomach ; 

 stomach distinct but not prominent, usually somewhat longer than 

 broad ; folds of the wall well defined, extending throughout its length, 

 usually regular but sometimes broken and anastomosing. Loop of in- 

 testine very narrow ; ascending limb taking the course usual for the 

 genus, but owing to the narrowness and length of the loop and the 

 small size of the branchial sac having inconspicuous windings. Loop 

 as a whole very straight. 



Post-abdomoi and reproductive apparatus. — Former very long 

 and slender and of uniform diameter for most of its length ; not dense 

 with food material and sexual products. Ovary a short distance be- 

 hind intestinal loop, rather small ; testis beginning immediately behind 

 the ovary and extending through almost the entire remaining portion 

 of post-abdomen ; masses regular in size and form, nearly spherical, 

 not crowded. Vas deferens distinct. 



Although this species is devoid of characters that differentiate it 

 strikingly from a number of other species, it is still impossible to iden- 

 tify it with any of them, and several of the differentia are important. 

 In the form and size of the colony it is strikingly like A. Jigarium 

 Ritter (MS.) from the coast of California; but the surface of the test 

 of this latter species is firmly incrusted with sand, while that of A. coei 

 is peculiarly devoid of sand or other foreign substances. The most 

 striking difference between the two is found in the zooids. The length 

 of the entire animal is about the same in both, but the branchial sac of 

 Jigariu?7i is three or four times as large as that of coei. In coei the 

 folds of the stomach wall are much more numerous and distinct than 

 '\\\ Jigariutn . Various other trivial but constant differences might be 

 mentioned. Another species with which it has much in common is 

 A. blochinanjti Heiden.^ From this it differs, however, in its less 

 distinct peduncle, larger size of the masses, smaller number of stig- 

 matic series, length and character of the atrial languet, and in the 

 greater distinctness and regularity of the folds of the stomach. It 

 gives me pleasure to name this species after my friend and efficient 

 fellow-collector on this expedition. Dr. W. R. Coe. 



Taken with the dredge, near the wharf in St. Paul harbor, Kadiak, 

 on July 3, 1899, in a few fathoms, rocky bottom, with coarse pebbles 

 and shells. Apparently very abundant here, as every haul brought up 

 a number of specimens. 



^ Zool. Jahrb., Band vii, 1894. 



