.\\TIHtMKIirs.K TI'KlilS. I!'.". 



Canals yellow. Found by Ouoy and Gaimard, and later by Haeckel, in the Straits of Gib- 

 raltar. Development unknown. 



Turris papua Lesson. 



Tuna papua, LFSSON, 1843, Hist. Zooph. Acalephes, p. 283; Prodromus, 1837, No. 36. EYDOI x I:T SOILEVKT, 1X41. 

 Voyage de la Bonne, tome 2, p. (t\q, plate i, figs. 1-3. HAECKKL, 1879, Sysl. der Meduscn, p. 58. MAAS, 1905, ( i 

 doten M.-dusen der Xibaga Expedition, Monog. 10, p. 14, taf. l, fig. 13; 1906, Kevue Smsse ilr Zool., tome 14, p. 8X. 

 BF-UOT, 1905, Revue Suisse de Zool., tome 13, p. 150 (all literature to 1850). 



.fyuorea tniiTti, LESSON, 1829, Voyage de la Coqiiille, Zool., p. 127, plate 14, fig. 4. 



(?) Tiara ocranica, AGASSIZ, A., and MAYER, 1902, Mem. Mus. Comp. Zool. at Harvard College, vol. 16, p. 141, plate I, fig. I. 



(?)Tf<vd intermedia, BROWNE, 1902, Annals and Mag. Nat. Hist., MT. 7, vol. 9, p. 277. 



Bell 28 mm. high, 14 mm. wide, with a solid apical projection and thin vertical walls. The 

 longest tentacles are about as long as the hell-height and have elongate, conical, basal bulbs, 

 with dark-red ectodermal ocelli on their outer sides. According to Lesson and to Eydoux et 

 Souleyet there are 8 tentacles: 4 radial, 4 interradial. Maas found 16 tentacles: 4 radial, 4 

 interradial, and 8 adradial. Agassiz and Mayer tound 32 tentacles: 8 long radial and 

 interradial, 8 short adradial, and lu very short intermediate tentacles. These differences may 

 he local variations, but can hardly be due to the medusae being in various stages of develop- 

 ment, for Agassiz's specimen was only 5 mm. high and had 52 tentacles, while Browne's 

 and Maas's specimens were 7 mm. high with only 16 tentacles. Moreover, Lesson's medusae 

 were larger and had only 8 tentacles. The 4 radial-canals are quite wide and have serrau-il 

 edges. The stomach is wide, swollen, and the lips complexly folded, and about at the level of" 

 velar opening. The gonads are in 4 interradial, horseshoe-shaped series of transverse swell- 

 ings on the sides ot the stomach, the open ends ot the horseshoe being directed downward 

 toward the mouth and the apex being near the aboral end ot the stomach. 



The entoderm of tentacle-bulbs and stomach is pink to dark-red. The gonads are pink t<> 

 dark brownish-yellow. 



Widely distributed over the Indian Ocean and tropical Pacific. 



It is probable that this form displays considerable variability in the number of its tentacles 

 and in the color of its gonads. It is closely allied to 'Turns superb a ot Tortugas, Florida, and 

 mav be identical with T. intermedia Browne, from the Falkland Islands. 



Turris prismatica. 

 Tiara pTiimalifa, MAAS, 1893, Ergeh. der Plankton Exped., Bd. 2, K. c.. p. f8, taf. 6, fign. 10, 1 1. 



Bell about 20 mm. in height, 12 mm. in diameter; 4-sided and prismatic in shape. There 

 is no apical projection and the bell-walls are remarkably thick. In the single specimen 

 described by Maas there are 12 tentacles, one at the foot of each of the 4 radial-canals. 3 

 others in one quadrant, 3 in another, and one in each of the other quadrants. It seems probable 

 that the specimen is abnormal and that there are normally in tentacles. The tentacles arise at 

 a slight distance above the bell-margin. Ocelli ( ?) The gonads are similar to those ot Tuna 

 pilnitii. In the preserved specimen the bell has a 4-sided prismatic shape. Color ( ?) A 

 single individual of this species was found by the Plankton Expedition on August 4, 1 880., in the 

 Gulf Stream. May it not be an abnormal specimen of Turris pileata ( ?) 



Turris reticulata Haeckel. 



Tiara retifitlala, HATI-WEI., 1879, Syst. der Medusen, p. 60, taf. 3, fig. 1 1 . 



Medusa bell-shaped, 12 mm. high and 10 mm. broad. There is a small, conical, apical 

 projection, about 1.25 times as high as it is broad. The stomach is 4-sided and pyramidal, 

 widest below, and its radial edges are bound throughout their length by the 4 radial-canals. 

 The 4 lips are large and much folded. There are 16 tentacles which are longer than the width 

 of the bell, and have large, laterally compressed bases, with ocelli on their outer sides. Their 

 are 8 separate, triangular gonads in the outer wall of the stomach. The surfaces ot the gonads 

 display complex anastomosing folds and swellings. 



This species was described by Haeckel from preserved specimens obtained in the South 

 Atlantic near the Island ot Tristan d'Acunha. 



