224 TJHivn-sHii of CaJifornia PuhlicalioHs i)i Zooloc/i) [Vol. 13 



There is a single tuft of curved, sharp-])<)inted collar setae, each of 

 which has a terminal wing-like expansion (pi. 12, fig. 44). In profile, 

 this expansion looks like a lateral wing ; seen in full face, it shows on 

 both sides of the central axis and is apparently a thin globular ex- 

 pansion which tapers to a point at its apex. The setae in other thoracic 

 fascicles are of two kinds, one similar to those of the collar while the 

 other kind are shorter and orbicular (pi. 12, fig. 45). Thoracic tori 

 are provided with uncini and pennoned setae. The uncinus has a 

 short base, one large tooth, and an apex with minute striations (pi. 12. 

 fig. 46). Pennoned setae of the usual type are present but have rather 

 larger terminal expansions. 



Abdominal ventral shields are as prominent as the thoracic shields 

 and, relatively, somewhat wider. The faecal groove crosses the shield 

 of the first abdominal somite, and divides all subsequent ones equally. 

 Abdominal setae are much longer than the thoracic ones. Abdominal 

 uncini are much like thoracic ones, but their bases are apt to have a 

 brown color. Terminal tooth very prominent, crest prominent, with 

 numerous striations, but not showing separate teeth. 



Collected from Honolulu Harbor, San Pedro, and San Diego. The 

 type Avas labelled haul 9, otf San Diego, but. as that haul was made 

 with a no. 20 net towed in 70 fathoms, it is probable that the label 

 was erroneously marked. Co-types also from San Diego. Specimens 

 from Honolulu had tubes covered with minute fragments of shells and 

 skeletons of Foraminifera, while some from San Pedro had tul)es 

 covered with fine sand. 



Type in the Museum of the University of California; co-type in 

 the American Museum of Natural History. 



Pseudopotamilla occelata Moore 



Pseudopotamilla occelata Moore (1905b), -p. 559, pi. 37. figs. 8-14. 

 Collected from Fort Ross Cove ; Lime Point. San Francisco Bay ; 

 and in the following hauls ; LXVIII, off San Diego in 19 to 30 

 fathoms on green mud and sand; LXXXII-1, off Point Firmiu in 

 27 to 30 fathoms on fine grav sand. 



Pseudopotamilla brevibranchiata ]\Ioore 



Pseudopotamilla hrevibrancMata Moore (1905b), p. 555, pi. 37. figs. 1-7. 

 Collected from San Pedro. 



