CTENOPHORA. 89 



Bolina infundibulum and Beroe cucumis, no other Ctenophores than these three being known from 

 this locality. (Cf. "Plymouth marine Invertebrate Fauna". Journ. Mar. Biol. Assoc. 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 I ^97 (Kgl. Svenska 

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

 Hj. The el in his paper "Om Utvecklingen af Sveriges zoologiska Hafsstation, Kristineberg, och om 

 Djnrlifvet i angransande 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 

 Honniphora 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 Pleuro- 

 brachia pileus and Hormiphora plumosa, their statements can not be disposed of as simple cases of 

 erroneous identification. That Aurivillius (Op. cit. p. 27) takes Cydippe quadricostata M. Sars (the 

 young of Bolina infundibulum, cf. p. 76) to be synonymous with Hormiphora 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 Hormiphora plumosa were found in the Plankton- 

 samples. 



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

 ments of Honniphora observed by A. G. Mayer 2 ) at the Tortugas, Florida, may as well belong to 

 one of the Atlantic species described by Chun (Ctenophoren d. Plankton-Expedition), H. spatulata 

 Chun 3) and H. palmata 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 Ed wards 5) - is recorded from the Coast of Scotland by 

 M'Intosh 6 ) 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 



') De danske Farvandes Plankton i Aarene 18981901, II., af Seren Jensen, A. C Johansen og I. Chr. L. Le- 

 vins en. K. Danske Vidensk. Selsk. Skr. 6. R. Bd. XII. 1903. p. 283. 



2 ) A. G. Mayer. Some Medusae 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 Chun (Op. cit) as a large specimen of Hormiphora 

 spatulata is perhaps only a Pleurobrachia pileus, 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 lies 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. Millie 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. 1841. p. 199. PI. 24. 



6 ) M'Intosh. Notes from the St. Andrews Marine Laboratory. IX X. Ann. Mag. Nat. Hist. 6. Ser. 2. 1880. p. 464, 

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



The Ingolf Expedition. V. i. 12 



