404 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



covered by the frontal crust ; in older zooecia all that is seen of the avicu- 

 larium is the mandible enclosed in the proximal border of the secondary 

 aperture. 



The ovicell is rounded, about 0.26 mm in width and very soon be- 

 comes completely immersed beneath the secondary crust of the two 

 lateral and the distal zooecia which usually leave a large irregular pore 

 at the point of junction. 



This is an arctic and northern species, on the Atlantic coast occurring 

 as far south as Mount Desert Island, Maine. Osburn recorded it from 

 Point Barrow and Icy Cape, Alaska (Canadian Arctic Exped.). 



Point Barrow, Alaska, G. E. MacGinitie (Arctic Research Labora- 

 tory). 



Smittina smittiella Osburn, 1947 

 Plate 47, figs. 11-12 



S?nittina smittiella Osburn, 1947 :37. 



? Escharella landsborovi var. minuscula, Smitt, 1873 :60. 



Smittina species, Marcus, 1938:44. 



The zoarium is encrusting, small, the largest colonies I have ob- 

 served are not more than 5 mm across. Apparently they mature very 

 rapidly as zooecia of the second row from the ancestrula are often pro- 

 vided with ovicells. 



The zooecia are rather small (average about 0.45 mm long), regu- 

 larly arranged, distinct, the frontal somewhat inflated and with numerous 

 pores. The primary aperture is rounded, with small cardelles and a broad 

 lyrula with laterally projecting corners. The median avicularium is small, 

 its mandible short oval (a little broader at the tip), elevated and project- 

 ing above the lyrula, and the tip of the rostrum is finely serrate or 

 denticulate across its upper border. The avicularian chamber is short 

 but extends laterally on both sides to marginal areolar pores. The peri- 

 stome is elevated into lappets on the sides, lower but continued around 

 the aperture distally on the infertile zooecia, low proximally and leaving 

 a rather deep secondary sinus on either side of the avicularian rostrum. 

 The ovicell is comparatively large, about 0.24 mm wide, prominent, 

 with pores similar to the frontal. 



Osburn listed the species from the southern shore of the Caribbean 

 Sea and Pensacola, Florida : Smitt's specimen was from Pourtales' Florida 

 collections, and Marcus recorded his "Smittina species" (which he assures 

 me, in litt., is smittiella) from the Bay of Santos, Brazil. It is therefore 

 a special pleasure to record this little species from the Eastern Pacific. 



