I 90 COE 



proboscis pore and one on each side, as in many related species, but 

 are well separated from the proboscis pore. 



Reproductive Organs. Sexual products had evidently been re- 

 cently discharged from specimens collected in August. 



Habitat. Common at Monterey, Calif., among kelp 'hold-fasts' 

 attached to stones on sandy or rocky bottom in 2 fms. Pacific Grove, 

 in crevices of rocks and under stones at low water. Dredged in several 

 localities off San Pedro in 2 to 20 fms. 



The species is named in honor of Prof. C. B. Wilson, of Westfield, 

 Mass., well known for his work on Nemertean development, to whom 

 I am indebted for several specimens of this and of other Nemerteans, 

 and for valuable notes on a number of the species described in this 

 paper. 



22. MICRURA NIGRIROSTRIS sp. nov. 

 pi. xvii, figs. 7, 8. 



Body of small size, only moderately slender, rounded anteriorly, 

 only slightly flattened in intestinal region; head commonly a little 

 wider than parts immediately following ; tip of snout rather narrow ; 

 cephalic slits of moderate length; mouth as usual, its anterior end 

 situated opposite posterior ends of cephalic slits ; proboscis long, 

 flesh-colored. Caudal cirrus was not found in the few living indi- 

 viduals examined, but is probably present in uninjured individuals. 



Color. Dorsal surface of esophageal region bright blood-red ; in- 

 testinal region of same color, but deeper, and sometimes with a tinge 

 of purplish. Ventral surface of same color, but usually paler and 

 duller in tone. Head of same blood-red color as esophageal region, 

 with a narrow, but very sharp and conspicuous, transverse band of 

 white near tip of snout. In ordinary states of contraction this white 

 band is crescentic or V-shaped, its convex side pointing backward in 

 the median line. It is a little wider laterally than in the middle, and 

 is limited to the dorsal surface, only its ends showing from below. 

 Immediately in front of this is a narrow, blood-red area bounded behind 

 and laterally by the narrow white band, and in the middle of the red 

 area, and situated on the exact tip of snout, is a small, rounded, dark 

 brown or black spot. On this dark terminal spot are scattered a few 

 minute whitish flecks. The brown or black spot is only slightly visible 

 on ventral surface, as it lies a little more toward the dorsal than the 

 ventral side of the exact tip of snout (pi. xvii, figs. 7, 8). 



Color after preservation brownish, but the narrow white ring near tip 

 of snout and the terminal black or dark brown spot are still retained. 



