410 



teral pouches of reserve stylets, but armed with central stylet and basis 

 only (figs. 1, 2), Central stylet minute, usually one-third to one-half 

 as long as basis, which is small and slender. Stylet region of probos- 

 cis can be withdrawn but little behind the brain; consequently the 

 anterior chamber is very short, without distinct muscular layers, with- 

 out distinct nerves, and without a thickened glandular epithelium 



such as occurs in almost 

 all other nemerteans. 

 Stylet apparatus imbed- 

 ded in a strong, muscu- 

 lar enlargement provi- 

 ded with numerous 

 large glands (figs. 1,2). 

 Chamber immediately 

 behind stylet, or mid- 

 dle chamber, small but 

 muscular, and with a 

 lining of flattened epi- 

 thelium, while the po- 

 sterior proboscidial ca- 

 vity is very short, often 

 almost spherical,highly 

 glandular, connected 

 closely with the rudi- 

 ments of the proboscis 

 sheath, and imbedded 

 in the connectivetissue 

 which lies internal to 

 the body musculature 

 (% 2). 



Cerebral sense or- 

 gans probably wanting. 

 Ocelli 2 (occasionally 

 fragmented into 4). 

 Cephalic glands massively developed; likewise a remarkable deve- 

 lopment of sub-muscular glands extends throughout the whole length 

 of the body, usually forming a distinct layer internal to the muscular 

 walls of the body, and thicker than all the other layers of the body 

 wall combined. 



Body musculature consists of a thin oblique or circular muscular 

 layer, and a somewhat thicker, but yet weak, longitudinal layer internal 

 to the former. 



>L.p. -rnc 



•^- 



Fig. 1. Optical section of anterior portion of body of 

 Carcinoiiemertes epialti. eg, outline of cephalic gland; 

 0, ocellus; ac, ?«c, j-jc, anterior, middle and posterior 

 chambers of proboscis respectively ; bi', brain ; i, intestine. 



