18/9.] PROF. J. It. GREENE ON A RARE MEDUSA. 793 



Head very wide, vertex impunctate, encarpae divided by a deep 

 groove ; face deeply excavated immediately below tbe antennae, the 

 anterior part of which is bounded at either side by a rounded lobe, 

 while the latter are covered at their outer edge with long bristle- 

 like hairs ; penultimate joint of the maxillary palpi greatly swollen 

 and dilated, the apical joint being almost buried in it ; antennae as 

 long as the body, the first joint very slender and curved, the second 

 very short, third joint as long as the first, dilated at the apex and 

 deeply excavated, fourth and fifth joints nearly equal in length and 

 as long as the first, covered, as well as the rest of the joints, with 

 fringes of short hairs. Thorax transverse, sides greatly diverging 

 from the base to the middle, from there to the apex produced and 

 rounded ; surface foveolate, either side near the base impunctate. 

 Scutellum flavous, broad. Elytra convex, transversely depressed below 

 the base, scarcely visibly punctured, from base to middle black, 

 thence to the apex fulvous. Tibiae and tarsi black. 



Only a single specimen, a male, is known to me. 



4. Note on a Specimen of Charybdea haplonema. 

 By Prof. J. Reay Greene, B.A., M.D., F.L.S., F.Z.S., &c. 



[Keceived November 29, 1879.] 



Dr. Pye-Smith, now Assistant Physician to Guy's Hospital, found, 

 some years since, in the Museum of that institution, a nameless Me- 

 dusa of strange appearance, from an unknown locality. Noting its 

 exceptional form, he made a drawing of it, and at the same time 

 observed such of its structural peculiarities as could be studied with 

 due regard to the conservation of the single sample at his disposal. 

 He also took the trouble of bringing the specimen to the meeting of 

 the British Association at Belfast ; but no one there could tell him 

 to what group of jelly-fishes it should be referred. Hearing of this 

 failure, I applied during the spring of the present year to Dr. Pye- 

 Smith, who most kindly gave me every opportunity of examining 

 this remarkable Medusa at my leisure. 



I soon found that I had not to deal with an undiscovered species, 

 but with none other than the Tamoya haplonema of Fritz Midler. 

 It belongs to Gegenbaur's Charybdeidce, a group not represented 

 among the Medusas of the British coasts. 



Tamoya haplonema was described and figured twenty years ago by 

 its discoverer, who found it on the shores of Santa Catha'rina (Brazil) 

 — "am Strande der Praia de fora bei Desterro." It was not un- 

 common, more than a dozen specimens being sometimes procurable 

 during one day. Occasionally it was accompanied by the much 

 rarer T. quadrumana. No other naturalist appears to have met with 

 these acalephs. 



Our Medusa, however, is very closely allied to Charybdea marsu- 

 jrialis, the common marsupial Medusa of the Mediterranean. This 

 species, the first discovered and best-known member of its group, is 



51* 



