NO. 1 FRASER : HYDROIDS 63 



tide; Santa Elena Bay, 8-12 fathoms; Port Utn'a, on coral at low tide; 

 Jicarita Island, low tide; Pacora Island, 15-25 fathoms; east of islands 

 off Navidad Head, 25-35 fathoms; Isabel Island, 15-25 fathoms. 



Plumularia biarmata, new species 

 Plate 14, Fig. 72 



Trophosome. — Colony with slender stem, 10 mm. high, and long, 

 slender hydrocladia. The stem is divided into regular internodes by 

 distinct nodes; each internode gives off a hydrocladial process near its 

 distal end; the hydrocladia alternating from side to side in the same 

 plane. Hydrocladia bearing as many as 8 hydrothecae; the first inter- 

 node is short with a transverse node proximally and an oblique one 

 distally; it does not bear a hydrotheca. All the other internodes are 

 hydrothecate. The internode is long and slender and the hydrotheca is 

 situated not far from the distal end. Each internode is rounded at each 

 end, so that the hydrocladium is very slender at the nodes. The 

 hydrotheca is but slightly deeper than wide. On each hydrothecate inter- 

 node but the first there are two mesial nematophores, one not far from 

 the base and the other near the base of the hydrotheca; the first one has 

 but one ; there are two supracalycine nematophores. There is no nemato- 

 phore on the proximal internode; there is one at the axil of the hydro- 

 cladial process and another cauline one, a short distance above it on 

 the next internode. 



Gonosome. — Not observed. 



Distribution. — Bahia Honda, 15-25 fathoms; Secas Islands, 15 fath- 

 oms; east of islands off Navidad Head, 25-35 fathoms. 



Plumularia corrugata Nutting 



Plumularia corrugata Nutting^ Am. Hyd., Part I, 1900, p. 64. 



Eraser^ Hyd. of Vancouver Island, 1914, p. 205. 



Distribution. — South Bay, Cerros Island, 10-15 fathoms. 



Plumularia defecta, new species 

 Plate 15, Fig. 73 



Trophosome. — Colony small, 8 mm., simple, unbranched; stem di- 

 vided into regular internodes by single transverse nodes. Hydrocladia 

 alternate, one to each internode, given off near the distal end ; each 



