44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. Y6 



bears scattered pores and three to four very salient spicules, erect, 

 almost cylindrical. The aperture is elliptical, little elongated; two 

 small cardelles separate a large anter from a small poster of the 

 same width; three to five long and very fine spines. The interzooe- 

 cial avicularia are long, large, salient wath pivot; the mandible is 

 very narrow. 

 Measuremsnts. — 



fAa=0.12mm. [Ztf-y^ 0.20-0.30 mm. 



A.V^rtxxv^[la=0.1Qmm. Aviculariaj z«^= 0.14-0.16 mm. 

 Diameter of spicules =0.04-0.06 mm. 



Structure. — Our colonies do not have their base. The ectocyst is 

 thick and hides the frontal pores. The large avicularia are oriented 



in every direction; they are nu- 

 merous at places and rare at 

 others. The mandible is narrow, 

 longitudinally convex, which 

 makes it appear much in a spe- 

 ^ ''"c"^ ^ ^^^^ preparation. 



E'iGURE 10.— nippoTREMA AND HippopoRiDuA, Tlic spiculcs f orm an orna- 

 Canu and bassler, 1927. A-c. Hippo- mental system particular to this 



TRHMA SPICDLIFEEA, NEW SPECIES. A, B, . \^ 



Opebcdla, X 85, AND c, MANDIBLE OP AN spccies. Tlicy arc sometimes hol- 

 AvrcuLAKiDM, X 85. D, opekcclum, X 85 Yoyy. The o p e r c u 1 u m has the 



OF HiPPOPOBIDKA GRANULOSA, NEW SPECIES '- 



form of the aperture. Two luci- 

 das indicate the place of the cardelles ; there are two lateral rectilinear 

 bands very near the border. It is thick, much chitinized, light colored. 



Affinities. — This is a very original species with no analogy with 

 the known species. It differs from Lepralia hrancoensis Calvet, 1907, 

 from the Cape Verde Islands in the presence of frontal spicules and 

 in a different operculum with no lateral contraction. 



Biology. — Our specimens w^ere living but not ovicelled on April 

 7-9, 1888. 



Occurrence. — Galapagos Islands, D. 2813 and D. 2815. 



Cotypes.—Ciii. No. 8519, U.S.N.M. 



Suborder Hexapagona Canu and Bassler, 1927 



Family CHAPERIIDAE Jullien, 1888 

 Genus CHAPERIA Jullien, 1881 



CHAPERIA CONDYLATA, new species 



Plate 9, Figures 1-3 



Description. — The zoarium incrusts dead bryozoa and nuUipores. 

 The zooecia are distinct, separated by a salient mural rim, ogival, 

 with transverse aspect. The mural rim bears six large distal spines 

 with a black articulation. The cryptocyst is deep and smooth and 



