NO. 4 HARTMAN : POLYCHAETOUS ANNELIDS 417 



ments. Nephridial pores are present on posterior thoracic and abdominal 

 segments located in the segmental grooves. 



Holotype. — AHF no. 121 ; paratypes in the Allan Hancock Foun- 

 dation. 



Type loaclity. — Sta. 1107-40, Espiritu Santo Island, Gulf of Cali- 

 fornia in 29-35 fms. 



Distribution. — A^. lobatus is known only from the upper end of the 

 Gulf of California at Consag Rock and south to Espiritu Santo Island, 

 in 21 to 35 fms on a muddy bottom. 



Notomastus giganteus Moore 



Moore, 1906, pp. 227-228, pi. 11, figs. 24, 25. Not Dasybranchus gigant- 

 eus Moore, 1909 (see above, underNoto?nastus ?nagnus) 



It has not been possible to examine any authentically labelled speci- 

 mens of this species nor any from near the type locality. The holotype 

 is deposited in the U.S. National Museum. The species vv^as originally 

 described from Chatham Strait, Alaska in 282-293 fms (Moore, 1906, 

 pp. 227-228) based on a single individual that was not very well pre- 

 served ; additional individuals attributed to the same species originated 

 in the Gulf of Georgia in only 31 to 90 fms. The following characters 

 are those of the holotype as first recorded. 



Total length is about 6 inches. The protruded proboscis (collapsed) 

 is discoid and wrinkled, hence presumably not papillated at the base. The 

 prostomium is a small, rounded lobe with a minute conical palpode. No 

 mention is made of eyes or nuchal slits. The thoracic segments are 

 strongly biannulate, the anterior ring the shorter. Each ring is marked 

 out in irregular areas [areolated] one series to each ring, but setigerous 

 segments 3 to 6 are irregularly arranged in 2 series. From the seventh 

 setigerous segment the rings are smooth, more glandular than those 

 anterior, and they decrease in length but the last one is about one and 

 one-half times as long as the first abdominal segment. No lateral sense 

 organs or genital pores could be detected in surface view. [Hence this is 

 at once different from A'^. inagnus, see above, in which both lateral 

 organs and nephridial apertures are conspicuous, pi. 50 fig. 1.] 



Abdominal segments are very short and have shallow, ill-defined fur- 

 rows. They are either simple rings or in the anterior region they are 

 obscurely biannulate. The surface is smooth, the integument provided 

 with a thick, glandular coat anteriorly. The neuropodial [originally 

 called notopodial] tori are very long, not elevated above the surface. 



