18G PEOCEEDIXGS OF UNITED STATES NATIONAL MUSEUM. 



Lineus dubius, sp. nov. 



Similar to the last in form and habits. Body very slender in exten- 

 sion, and attenuated posteriorly. Head elongated, narrow. Ocelli ^cMte, 

 inconspicnous, forming a simple lateral row of about twelve, extending 

 back on each side of the head, beyond the lateral (nasal) fossa^.. Color 

 light green to dark olive-green. Length of largest observed, 50'"'^ to 



to" 



Gloucester, Mass., under stones, between tides, 1878. 



Lmeus pallidiis, ^5p. nov. 



Long and very slender in extension, subterete, attenuated posteriorly. 

 Lateral (nasal) fossai long and deep. Mouth situated far back. Head 

 elongated, usually obtuse and wider than the body, but very changeable. 

 Ocelli absent. Color usually whitish or pale ocher-yellow, becoming 

 reddish toward the head, and with a rather indistinct paler dorsal line ; 

 anteriorly there are usually two pale dorsal spots, in front of whit;h the 

 head is yellowish. Length, in extension, 100'""^ ; breadth, 0.5'"™ to 0.75"^">. 



Off Cape Ann, Mass., 45 fathoms, mud, 1878. 



Micrura affinis Y. (=Po?irt affinis Girard, in Stimpsoii). 



This species is very common from Massachusetts Bay to the Bay of 

 Fundy, in 10 to 100 fathoms, on hard bottom. It is usually bright clear red 

 or reddish brown above, rarely varying toward dark olive-green ; beneath, 

 pinkish white ; front of head with a white margin running back in a short 

 median i)oint. Ocelli black, several in a single row on each margin of 

 the head, the front one largest, variable in number. Caudal filament 

 slender, acute, white. Length, often 125-» to 150-"; breadth, 2 -"^ to 



Micrura inornata, sp. nov. 



Body subterete, moderately elongated, thickest anteriorly, gradually 

 tapered to the somewhat flattened tail; caudal filament white, very 

 slender and acute, sometimes as long as the diameter of the body, but 

 usually less. Head obtuse, often as wide as the body or wider. Lateral 

 foss.T- deep, extending to opposite the mouth, the latter not being very 

 far back. Ko ocelli. Color bright cherry-red, varying to dark red, the 

 middle of the head brightest ; tail pale. Length of largest specimens 

 observed, about 75'"-^^ ; breadth, 0.10"™ to 0.12""". 



Massachusetts Bay and Gulf of Maine, 45 to 110 fathoms, mud. Ee- 

 sembles the young of Cerehratulus luridus V., which occur with it. 



Micrura albida, sp. nov. 



Body thickest and nearly round anteriorly, tapered and somewhat flat- 

 tened posteriorly, with a small, slender, caudal filament. Head obtuse, 

 narrower than the body. No ocelli. Lateral foss?e short, not conspicu- 

 ous. Color whitish or pale yellowish, often becoming light red toward 

 the head ; posteriorly often with grayish or clay -colored internal mottlings 

 along the sides. Very sluggish in its motions. Two specimens from 



