Introduction to Animal Morphology. 205 



and eight of \vater. Trachelobdella has no ocelli, and a 

 round retractile neck (found on Gobius Capito). Bdella 

 has a deep grove on the under side of the fore lip. Podo- 

 bdella is elliptic, closely ringed, without eyes or teeth, and 

 with a stalked sucker. Pinacobdella has an elongate body, 

 with seventeen dorsal scutelhi and no eyes. Typhlobdella 

 sub-lanceolate, with 81-93 rings, three jaws, no eyes; it in- 

 habits the subterranean waters of the Baradla cave at Aggtelek, 

 Hungary. Its orifices are as in Hirudo. 



CLASS 8. OXYCHOPHORA (Gmbe). One genus 

 (Peripatus) with an elongated, cylindrical body of 

 several metameres, head lobes and mouth segments 

 united, and with two frontal feelers and two eyes. 

 The mouth is very shortly protrusible, with two 

 parallel, hook-like teeth. The pharynx is short, 

 divided into a wide anterior and a narrower posterior 

 part. The stomach forms a simple tube, ending in a 

 short narrow intestine. There is a soft epidermis, a 

 connective derm is, three muscular layers as in leeches, 

 and no surface bristles ; but each of the down-directed 

 feet bears a single, double, or multiple chitinous claw. 

 Tin- vascular system consists of a single dorsal stem. 

 Tuo lateral canals exist imbedded in the muscular 

 lamincT, which may also be vessel stems, but they 

 have a glandular lining (Grubc]. No other excretory 

 US an- described. The nerve system consists of a 

 pair ly united, lar^e ^an^lia above the 



pharynx, which send branches on each side of the tube* 

 to unit.- below. Two diver^ine;, ventro-lateral cords 

 '.iich unite at the end, and the two cords 

 'whieh are roated with nervecells .ire joined by many 

 line commissural threads. Th, six single 



branches from the < ,,ni in each metamere, but there 



are no sp.-< i.d ^.in^lionic differentiations in its course. 



