94 



NEW YORK STATE MUSEUM 



hep.ia 



mo 



Fig. 35 Diagrammatic view of median longitudinal section of Liinulus. 

 Lettering as al)Ove. (After Parker and Haswell.) 



A comparison of this intestine with that of Linuilus (see text 

 figure 35) shows that the two are identical in shape and position; the 

 exposed part of that of E u s a r c u s n e w 1 i n i beginning with 

 the sHghtly expanded anterior portion of the mesenteron behind the 

 stomach (proventriciihts). The latter was, undoubtedly, as in 

 Limulus, situated at the anterior extremity of the cephalothorax 

 and extended downward, being more or less bent upon itself, leading 

 anteriorly into a suctorial pharynx and the oesophagus, and being 

 surrounded by a large gland, the so-called " liver." 



The intestine or inesenteron itself was a straight tube, relatively 

 much longer than in the more compact Limulus. 



The posterior portion exhibits distinct longitudinal folds and 

 possessed thus a like structure as the proctodaeum or rectum of 

 Linuilus.* 



It appears that the proctodaeum was as in other eurypterids, first 

 bent upward, producing in some, as in Pterygotus, a crest by 

 impinging against the dorsal side of the ultimate segment, and then 

 sharply downward ; the anus, which was on the ventral side, not 

 being exposed in the specimen. 



The preservation of the intestine is proof that the specimen was 

 not originally a molted skin, but a whole individual that became 

 entombed at the bottom of the sea; and the excellent preservation 

 and undisturbed position of the appendages indicate that the creature 



* See the elaborate " Studies of Limulus " by Patten and Redenbaugh. 

 (Journal of Morphology, v. 60, 1900.) 



