CTENOPHORA. 



89 



BoUua infundibuliivi and Beroc cuaimis, no other Ctenophores than these three being known from 

 tliis locality. (Cf. "Plymouth marine Invertebrate Fauna". Journ. Mar. Biol. A.s.soc. VIII. 1906. p. 206). 



The species is further stated by C. W. S. Auri villius in his "Vergleichende thiergeographische 

 Untersuchungen iiber die Plankton-Fauna des Skageraks in den Jahren 1893 - 1897 (Kgl. Svenska 

 Vet. Akad. Handl. Bd. 30. 1898) to occur in the Skagerak in the months of July — November, and likewise 

 Hj. Theel in his paper "Om Utvecklingen af Sveriges zoologiska Hafsstation, Kristineberg, och oni 

 Djiirlifvet i angramsande Haf och Fjordar" (Arkiv for Zoologi. Bd. 4. No. 5. 1907, p. 61) records it to 

 occur in the Gullmar Fjord (at the Swedish Coast of the Skagerak) in the month of August. It is impos- 

 sible to say at present whether these statements are correct or not. No material of the supposed 

 Hormiphora is found preserved either in the Stockholm Museum or at the Zoological Station at Kri- 

 stineberg, as I am informed by Professor Theel and Dr. Ostergren, so I have been unable to 

 reexamine any of the specimens thus identified. Since, however, both authors mention both Plciiro- 

 brachia pilcus and Horniiphora pluinosa^ their statements can not be disposed of as simple cases of 

 erroneous identification. That Auri villi us (Op. cit. p. 27) takes Cydippc quadricostata M. Sars (the 

 \oung of BoUua iiifiindibuhtin, cf. p. 76) to be synonymous with Ilortuiphora plumosa does not support 

 the correctness of his identification of this species; but, on the other hand, it is not a sufficient proof 

 either, that the identification was incorrect. In the Report on the Plankton of the Danish Seas in 

 1898—1901") it is stated that no specimens of Honjup/iora pliiinosa were found in the Plankton- 

 samples. 



With certainty Honniphom plumosa is as yet known only from the Mediterranean. The frag- 

 ments of Iloniiiphora observed by A. G. Mayer^) at the Tortugas, Florida, may as well belong to 

 one of the Atlantic species described b\- C h u n (Ctenophoren d. Plankton-Expedition), //. spatulafa 

 Chun 3) and H. pahnata Chun. 



Lesueuria vitrea M. Edw.4). This form, known otherwise only from the Mediterranean — 

 where it has been observed only a few times (in 1852 by M. Sars and in 1870 by Spagnolini) since 

 it was described in 1841 by Milne Edwards?) — is recorded from the Coast of Scotland by 

 :\rintosh^) in 1888— 1890, but has not been met with anywhere since then. This remarkably irreg- 

 ular occurrence may be explained in different ways. It might be supposed that the Lesueuria is a 



1) De danske Farvandes Plankton i Aarene 1898-1901, II., af Soren Jensen, A. C. Johansen og I. Ch r. L. Le- 

 vinsen. K. Danske Vidensk. Selsk. Skr. 6. R. Bd. XII. 1903. p. 2S3. 



2) A. G. Mayer. Some Medusas from the Tortugas, Florida. Bull. Mus. Comp. Zool. XXXVII. 1900. p. 82. 



3) It may be suggested that the specimen figured in Taf. III. Fig. 4 by C h u n (Op. cit.) as a large specimen of Hormiphora 

 spatulata is perhaps only a Pleiirobrachia pileiis, the unusual place of the tentacle-bases being due to contraction on preserv- 

 ation (Comp. Fig. 13. b. p. 70). That the tentacles have only simple branches is certainly not in contradiction with this 

 suggestion, and there are no facts to support the assumption of Chun (Op. cit. p. 17) that the eolidia-shaped branches of the 

 tentacles disappear with age. The level at which the opening of the tentacle sheath hes is also more in accordance with 

 PI. pileus than with the specimen of Harm, spatulata of 8 mm length in Taf. Ill, Fig. 3. 



4) On p. 60 is wrongly named Lesueuria hyboptera A. Ag. 



5) H. Milne Edwards. Observations sur la structure et les fonctions de quelques Zoophytes, Mollusques et Cru- 

 staces des Cotes de France. Ann. d. Sci. nat. Zoologie. 2. Ser. XVI. 1S41. p. 199. PI. 2—4. 



6) M'Intosh. Notes from the St. Andrews Marine Laboratory. IX— X. Ann. Mag. Nat. Hist. 6. Ser. 2. iSSo. p. 464, 

 6. Ser. V. 1890. p. 46. 



12 



Tlie Ingolf Expedition. V. 2. 



