BY N. A. COBB. 773 



Habitat. — This species is very common among algse on the 

 coasts of the European branches of the Atlantic Ocean. 



Ail, ^r • '3 l-l'S 25'6 '50'^° 86'8„. „ m j. 1 T • 



L A.leptura,^v3iVioxi. 1 -4 2-7 35 — ? pga-mm. i he pectoral hairs 



are grouped in six rows, four of the rows being submedian and 

 two median. These rows, each about as long as the head is wide, 

 and each consisting of about a dozen closely approximated hairs, 

 are situated on the anterior part of the conoid neck somewhat 

 behind the porus, the median rows growing a little farther back 

 than the submedian. Six (X) long and slender setae occur on the 

 head. Each of the three (J) lips is surmounted by a large conical 

 papilla. The conoid oesophagus is one-third to two-fifths as wide 

 as the neck and passes the food on to an intestine three-fourths as 

 wide as the body. The excretory pore occurs at 2-5 per cent. 

 The tail is conoid to the slightly swollen ellipsoidal terminus, 

 which gives exit to the secretions of the caudal glands. The lips 

 of the vulva project slightly. The ovaries extend two-thirds the 

 distance back to the vulva, and near their blind extremities are 

 packed with developing ova arranged in several pai'allel rows. 

 The uteri commonly contain two or three unsegmented eggs as 

 long as the body is wide and less than twice as long as wide. 



rr^2^ 7 1-5 " ^i-s''' -• '"'"• The linear {X) spicula are arcuate in the 

 distal third and present bifurcated proximse. The short accessory 

 pieces surround the spicula near the anus. The presence of a 

 supplementary organ has not been noted. 



Habitat. — Rocks, Pharo, coast of France. Common in February. 



EXPLANATION OF FIGURES. 



Fig. 1. — Anticoma typica. The $ is shown in full, x 65 : anteriorly are 

 seen the resophagus (grey), the nerve-ring (white) and the 

 ventral gland (black) ;' through the middle, tlj^ intestine (dark) 

 and the sexual organs (light). The upper right-hand figure 

 shows the head in dorso-ventral view, x 450. The lower right- 

 hand figure shows the anal region, x 350 : to be seen are the 



