2 76 A. S. PACKARD, Jr., ON THE RECENT 



%LJ heJ 0CCm ' ° n the ° WeSt CellS " ChateaU BaJ ' n0t unfre 1 uen % f ^nd with Flustra 



Myriozoum subgracile D'Orb. 



Alillepora truncata Linn. Fabr., Faun Griinl. 



Frequent with the other species. 



Fabricius's description applies well to this species. It grows two or three inches high 

 branching d.chotomously ; branches cylindrical, smooth, while at irregular distances slightly 

 contracting,— passim annulis angustforibus — cells immersed; apertures round with a°verv 

 narrow, deep sinus, those at the end of the truncate branches have the figuram calcei eauini 

 of Fabriciuss description. The surface between the cells is deeply and irregularly punct^ 

 ureA A transverse section of a branch shows about twelve oval cells separated by thin 

 walls, arranged around the solid axis of the stem. 



This species approaches somewhat Busk's Escliara teres, (Ann. Nat. Hist 1856 ) but it 

 seems to have a more regular form ; the oval cells shown in a transverse section are not so 

 much produced toward the central axis of the stem; while it differs wholly from K teres 

 in the punctures dotting thickly the whole surface between the cells, instead of there bein* 

 a single row surrounding the aperture, as usual in the genus. MiUepora truncata is a Medi- 

 terranean species, and, as represented by Lamouroux, is a much larger and very different 

 form from the two species above mentioned. On the Bank in fifty fathoms, with the pre- 

 ceding species ; also from the Banks of Newfoundland, and the Bay of Fundy. 



TUNICATA. 

 Leptoclinum sp. 



A species of compound ascidian was abundant in somewhat pellucid masses surrounding 

 branches of nulhpores in fifteen feet. S 



Didemnium roseum Saks, Reise i Lofoten og Finmarken, p. 33, 1850. 



Colony forming a calcareous, thin, encrusting mass, coriaceous, much expanded, surface 

 finely granulated, being covered densely with round, mammillated bodies. ' Bran ho" 

 fices rudely arranged in quincunces, slightly raised above the surface, formed of six trian- 

 gular lobes with the alternating lobes a little unequal in size, composed of three or four 

 granules a little larger than those on the surface generally 



TT I L b T S 9 a ^°'TrT bL T Ce i t0 Didemnium **"*** Grube, (Ausflug nach Trieste. Taf. 

 11, ng. A, A ,) but the branchial openings are thicker and the mass thinner and more calca- 

 reous in _our species. It agrees exactly with Sars's description of D. roseum, though it is 

 whitish in alcoholic specimens. ° 



Found frequently encrusting fucoids in masses an inch in diameter, in ten fathoms, Hope- 

 dale ; and on the whole coast. I have also dredged it at Eastport in twenty fathom! 



Ascidia eallosa Stimps. Proc. Bost. Soc. Nat. Hist. 

 Abundant at the Straits of Belle Isle in forty to fifty fathoms, occurring as on the coast 



Cenhv Z .mT,^ V arSer SlZe ^ maSSeS aff0rdi ^ Shelter t0 ™™ us worms, 

 Gephyrea and Modiolan*, and serving as a base of attachment to numerous Hydroids 



