ON SOME OIGOPSID CUTTLE FISHES. 
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PLATE IX. 
Figs. I — 9. — Doratopsis vermicularis . 
Figs. 1 — 3. Drawn by Miss Stone. Ventral (1), dorsal (2), and lateral 
(3) views, lent. Tentacular arms. dell. org. Stellate organs, olf. 
org. Olfactory organ, nuchal cart. Nuchal cartilage. 
Fig. 4. View of oral surface, p. lip. Papillate lip. b. mernb. Buccal 
membrane, t. Tentacular arm. iv. Fourth pair of arms with single 
row of suckers. 
Fig. 5. View of interior of mantle cavity. m.f. Mantle fastening. 
r. p. Renal papilla. p. vein. Posterior renal vein. g. gl. Genital 
gland. 
Fig. 6. Portion of neck region (dorsal), showing the stellate organs, 
si. org. v. n. visceral nerves, aorta, and a. c. alimentary canal. 
Fig. 7. Tentacular club. 
Fig. 8. Funnel opened along median line, showing valve, lateral pads of 
Verrill’s organ, vena cava (v. c.), ink sac, and rectum. 
Fig. 9. Ventral view of head region showing the olfactory organs, iv. 
Fourth pair of arms. tent. Tentacular arms. 
PLATE X. 
Figs. 1 — 4. — Tracheioteuthis Behnii. 
Fig. 1. Dorsal view. p. p. Pigmented patches, n, in. Second and third 
arms, with larger suckers. 
Fig. 2. Ventral view after opening the mantle, o. o. Olfactory organ 
supplied by nerve («.). m.f. Mantle fastening. m. d. i. Musculi 
depressores infundibuli. v. c. Vena cava. r. Kidneys, red. Rectum. 
c. Ridge, cartilaginous ridge for mantle fastening. 
Fig. 3. Tentacular club, with lateral protective membrane ( l . m.). 
Fig. 4. Funnel, opened to show valve and median papilla (m. p.) and 
lateral pads (/. p.) of Verrill’s organ, c. groove. Cartilaginous groove 
for mantle fastening. 
Figs. 5 — 7 show modifications of the olfactory orgau (o. o.) — Histioteuthis, 
Loligo, and Thysanoteuthis. t. c. Anterior transverse crest, t. d . Posterior 
transverse crest. 1. c. Longitudinal crest, e. Eye. 
Figs. 8 — 12. — Histioteuthis Ruppelli. 
Fig. 8. Renal chamber opened, showing v. c., vena cava, and h. d., hepa- 
tic ducts with renal appendages. 1. m. Lateral renal masses on the 
renal veins, ov. gl. Oviducal gland, red. Rectum, br. heart. Branchial 
heart, r. p. Renal papillae, v. p. s. Viscero-pericardial aperture. 
