NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 141 



The vibracular chamber is elongate, nearly half as long as a zooecium, 

 and visible from in front for half of its length; groove longitudinal; seta 

 very long, occasionally more than 1.00 mm, but usually shorter. The 

 radicle chamber is situated at the proximal outer border of the vibracular 

 chamber; the radicles measure 0.03 mm in diameter and are provided 

 with retrorse barbs throughout most of their length. 



The ooecia are somewhat variable in form but are usually a little 

 broader than long (average width 0.22 mm, length 0.20 mm), elevated 

 at the tip and extending somewhat over the scutum of the distal zooecium, 

 the front a little flattened and with non-tubular pores which are con- 

 nected by wavy lines. 



The species, described from Queensland, Australia, has been taken in 

 the Red Sea, East Africa, Indian Ocean, the East Indies and the Island 

 of Tahiti. It has not been previously recorded from the Eastern Pacific 

 region and our material shows some differences, but not sufficient to war- 

 rant the erection of a new species. There are no bifurcate oral spines, 

 while in obtecta, according to Harmer (I.e.) the second outer and first 

 inner are forked ; Harmer described the opesia as having "hardly any 

 cryptocyst," which agrees very well with only the younger zooecia in our 

 specimens, and he states that the ovicells are "rather elongate" while in 

 our material they vary and are usually slightly broader than long. There 

 is, however, a close agreement in the form of the zooecia, avicularia, 

 vibracula and scutum and in the size of the opesia. 



Hancock Station 557-36, off White Rock, Isia Partida, Gulf of Cali- 

 fornia, 28°55'30''N, 113°05'35"W, 45 fms, several colonies. 



Scrupocellaria panamensis new species 

 Plates 17, figs. 5 and 6, and 20, fig. 2 



Zoarium somewhat recumbent, branching dichotomously, the inter- 

 nodes usually about 1 mm in length but occasionally as much as 2 mm, 

 6 or 8 zooecia in a series; the joint crossing the lower part of the opesia 

 of the outer zooecium. 



The zooecia are short and wide (0.26 to 0.30 mm long by 0.20 mm 

 wide), a little narrowed proximal to the opesia, which occupies about 

 two-thirds of the front. The opesia is elliptical in outline with a well 

 developed cryptocyst which is finely granular and which is only slightly 

 narrower distally. A broad, heavy, branched scutum covers practically 

 all of the opesia when fully developed, with 3 to 5 main branches and 

 these often branched twice or three times (as many as 26 points have 

 been counted) ; the stalk large and attached at the middle or a little 

 proximal to the middle of the opesia. The oral spines are usually 5 or 6 



