172 MESSRS. L. MURBACH AND C. SHEARER ON [June 16, 



clearly distinguished. The radial canals are four in number, 

 simple, and opening into the angles of the stomach. The stomach 

 is short and broad, a short proboscis connecting it with the lobed 

 mouth below. The gonad-masses are interradial. No gastral 

 peduncle could be distinguished. 



HaUtat. — Victoria Harbour, collected by Shearer. 



Discussion. — The single specimen was so badly preserved as to 

 render certaiia identification almost impossible. It has been placed 

 under H. mertensii, the form it seems to resemble most. This 

 Medusa was first described by Lesson (24) under the name of 

 Gyanea bougcoinvillii. Brandt, five years later, described it from 

 the drawings and manuscripts of Mertens under the name of 

 Hipj)ocrene hougainvillii Lesson, changing this again a year later 

 to Bougcdnvillia macloviana. Lesson met with it at the Island of 

 Soledad, while Mertens found it at St. Matthei Island, Behring's 

 Strait. Agassiz reports this species from the region of Puget 

 Sound, Port Townsend, and the Harbour of San Francisco. 

 Hartlaub (20) has suggested that Agassiz is mistaken in identi- 

 fying his species with that of Mertens on account of size. Agassiz 

 states that his specimens were larger than B. super ciliaris, while 

 Brandt describes the species as the size of an " ordinary pea," 

 B. superciliaris measuring some 8 mm. in height ; this would make 

 B. mertensii of Agassiz some 9 or 10 mm. in height. Hartlaub (20) 

 has recently given an extensive description of the Heligoland 

 species of Bougccinvillia in the ' Meeresfauna von Helgoland.' 



B. LEPTOMEDUS^. 



I. THAUMANTiDiE Gogenbaur. 

 Thaumantias Eschscholtz. 



1. Thaumantias cellulaeia Haeckel (18, p. 129). (PI. XVII. 

 figs. 2, 2 «, & 2 b.) 



Synonym Laodicect cellularia A. Agassiz. 



Specific descriptio7i. — The bell is rather flat, 5 to 9 cm. broad 

 by 2*5 to 3'5 cm. high, somiewhat resembling Staurophoixt in 

 appearance. The tentacles form a fine fi'inge around the bell- 

 margin, being not more than a third of its diameter in length, 

 coiled up to their oval spindle-shaped tentacle-bulbs, which are so 

 numerous as to almost touch one another. The numbei- of 

 tentacles is about 340. In specimens presei'ved in formalin 

 neither ocelli nor cirri are visible. In pi-opoi-tion to the size of 

 the animal the velum is naiTOw and delicate, being only 5 mm. 

 broad. 



The radial canals run from the circular tube of the bell-margin 

 to the highest point in the roof of the stomach, where they cross 



