302 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



79. Amphiporus peruvianus, new species 



(Plate 27, figs. 31, 31a) 



Two well-preserved specimens of a species which appears to differ 

 from any of the many described members of this genus were collected by 

 the Allan Hancock Expedition of 1935. 



Body. Very slender, measuring after preservation about 24 cm in 

 length and 4 mm in width. 



Color. Color in life unknown; pale grayish yellow after preservation. 



Ocelli. A single row of 8-10 rather large ocelli lies on each antero- 

 lateral border of head, followed by an irregular transverse group of 16-20 

 somewhat smaller ocelli extending nearly to median line on each side of 

 head immediately anterior to brain (Fig. 31 ). 



Proboscis. Sheath extends nearly entire length of body. Proboscis 

 large and long, exceeding body in total length ; armed with slender central 

 stylet nearly 1^ times as long as oval basis (Fig. 31a). In one of the type 

 specimens, stylet measured 0.14 mm in length and basis 0.1 mm in length 

 and 0.07 mm in diameter. Each of the 2 lateral pouches contained 4-5 

 accessory stylets. There were 20 proboscidial nerves. 



Nephridia. The nephridial system differs from that of any other 

 known species. Such a profuse tangle of intertwining tubules surrounds 

 each of the lateral blood vessels as to constitute a sharply demarcated 

 nephridial gland extending from brain to near end of pyloric region of 

 body. A transverse section of the body may show 30 or more sections of 

 large and small collecting tubules surrounding each of the lateral blood 

 vessels. There are several pairs of very slender efferent ducts. 



Cerebral sense organs. Large, situated beside brain. Ducts to exterior 

 extend obliquely forward to open in oblique grooves on ventrolateral 

 surfaces of head. 



Habitat. Shore near low-water mark. 



Distribution. At present known only from Vieja Island, Independen- 

 cia Bay, Peru. 



80. Amphiporus punctatulus Coe, 1905 



A. punctatulus Coe, 1905a. 



Habitat. Beneath stones in muddy situation. 



Distribution. At present known only from Isthmus Cove, Catalina 

 Island, California. 



