174 Bulletin, Vanderbilt Marine Museum, Vol. IV 



terior two-fifths. The ventral cartilaginous ridges are short, extend- 

 ing less than one-fourth of the distance from the mantle margin to 

 the fin insertion, and are ornamented with ten clusters of tubercles 

 of different sizes, as illustrated in figs. B and C. The tubercles of the 

 two ridges are not identically developed, but are very similar. The 

 fin is subcircular, with the posterior half of the margin more broadly 

 rounded than the anterior half, which is somewhat sloping, as shown 

 in figure A. The funnel is short. The head is small. In the dead 

 specimens, the strong muscle bands show prominently, as indicated 

 in figures A and C. The arms are weak, slender, decreasing in length 

 in the order 3, 2, 4, 1; two and four being subequal, one slightly 

 shorter, while three is one and two-fifths times as long as two. A 

 typical sucker from one of the sessile arms is shown in figure E. The 

 tentacular arms are well developed, very extensile, with a well-devel- 

 oped club, which has the lateral margin developed into a protective 

 membrane, with wavy margin, and transverse muscle ridges on the 

 ventral surface between the suckers as indicated in figure F. One 

 of the large suckers from the tentacular arm is shown in figure D. 

 There is an adhesive organ at the proximal end of the club, formed 

 of a cluster of small suckers. 

 References: Loligopsis schneehageni Pfeffer, Abhand. Gebeite der 



Naturwissenschaften, Hamburg, vol. VIII, Heft. 2, p. 23, fig. 31, 



1884. 

 Zygaenopsis zygaena Pfeffer (Partim), Mitteil Naturhist. Mus., vol. 



XXV, (Jahrb. Hamburg Wissensch. Anstalten), vol. XVII, p. 



193, 1900. 

 Taonius schneehageni Hoyle, Kept. Voyage "Challenger," Zool., 



vol. XXVI, p. 44, 1886.— Vanderbilt, Wm. K., To the Galapagos 



on the "Ara," Appendix, p. 149, color plate 30, 1927. 

 Pyrgopsis schneehageni Pfeffer, Die Cephalopoden der Plankton 



Exped. der Humboldt Stiftung, p. 658, pi. 47, figs. 14-17, 1912. 



Section: MYOPSIDA D'Orbigny. 



Family: SEPIOLIDAE Steenstrup. 



Genus: SEPIOLA Rondelet, Leach. 

 Sepiola rondeletii (Gesner, 1555) Leach, 1817. 



Plate 109. 

 Type: Not traced. This is one of the oldest described European 

 species, having been discussed by Rondelet in 1554, and described by 

 Gesner in 1555. 



