BATHYPELAGIC SQUID BATHYTEUTHIS 87 



lateral edge of the vane folds under to form a shallow, cup-shaped 

 tenniniis of the grladiiis. 



In contrast, the long narrow rhaciiis of Bathytevthis is C-shaped in 

 cross section; its lateral edges are rolled under to form longitudinal 

 rods, and it lacks a median ridge. The lateral rods of the rhachis taper 

 along the vane and terminate before the end of the gladius. The 

 vane is tissue-thin and marked with series of concentric lines. A conus 

 is lacking in Bathyteufhis. too; the posterolateral edges of the vane 

 barely turn under to form a broad, spoonlike, tissue-thin end to the 

 gladius. Therefore, the gladii of the two genera exhibit marked dif- 

 ferences. 



The eyes of Ctenopteryx are huge and are directed laterally. A large, 

 strip-photophore is located on the ventral half of the bulbus (in some 

 species, at least). The eyes of Bathyteuthis are large and globular; 

 they are directed anterolaterally. Photophores on the eye are unknown. 



The muscular bridles that connect the anterior dorsal wall of the 

 funnel to the ventral surface of the head are narrow and thin in 

 Ctenopteryx. In Bathyteuthis the bridles are broad, thin bands em- 

 bedded in the posterior depression of the funnel groove. 



Some Ctenopteryx have a huge, median, visceral photophore. Vis- 

 ceral photophores are lacking in Bathyteuthis., but it has six simple 

 photophores at the bases of the dorsal three pairs of arms. Ctenopteryx 

 has no corresponding light organs. 



The female reproductive systems show marked dili'erences between 

 the two genera. The oviducal glands of Ctenopteryx are small and in- 

 conspicuous; they are flat, round glands that lie within the viscero- 

 pericardial coelom. The oviducal glands of Bathyteuthis are large, 

 conspicuous, swollen structures that lie in the mantle cavity dorso- 

 lateral to the nidamental glands. The nidamental glands of both 

 genera are similar in structure and positon. The most striking feature 

 of Ctenopteryx is the posse.ssion of "accessory nidamental glands." 

 No other oegopsid, including Bathyteuthis, is known to have these 

 glands. Accessory nidamental glands are found in sepioids and 

 myopsids. In Ctenopteryx the supposed accessory nidamental gland is 

 a single, median structure that lies on the wall of the nephridial 

 coelom anterior to the nidamental glands and ventral to the kidneys. 

 It is flat, lobate, glandular, and unsculptured ; it bears little resem- 

 blance to the paired, swollen, striated accessory nidamental glands of 

 myopsids and sepioids. 



This review of the characters of Ctenopteryx reveals that Bathy- 

 teuthis and Ctenopteryx share some features that may indicate rela- 

 tionship: simple mantle-funnel locking apparatus; short, simple club 

 with many (8-14) rows of minute suckers; short arms with more than 



