7" The American Naturalist. [January 



identical, I do not find it so easy to refer them to D. nodulosum, as 

 described by Von Linstow, Archiv f. Naturg., 1873, XXXIX, where 

 the larval stage from Paludina impura and the adult from Perca flu- 

 viatilis are figured. The same difficulty is experienced when they are 

 compared with Olsson's account, Bidrag till Skand. Helm., pp. 23— 

 24. Taf. IV. fig. 51, where a side view of the head of an adultis 

 figured. 



The cysts were found " about the heart, intestine and other organs 

 in the hinder part of the thoracic region." They were collected in 

 December 1891. 



It cannot be concluded, from the specimens at hand, that the cray- 

 fish is a proper intermediate host of this parasite, although the consid- 

 erable number of cysts and the different degrees of development of 

 their contents make the inference not altogether improbable that they 

 are genuine guests and not strangers which have strayed into an 

 unusual host.— Edwin Linton, Washington and Jeffervm ('oiler, 

 Washington, Pa., Dee. 31, 1891. 



Branchiostoma elongatum Sundevall at San Diego, Cal- 

 ifornia.— In 1868 Cooper described three specimens of a Branchios- 

 toma which he obtained near La Playa in San Diego Bay in 10 

 fathoms of water. Since then Branchiostoma has not again been 

 recorded from the Pacific Coast of America. Last Summer on visiting 

 a dredge which was at work in San Diego Bay near Ballast Point 

 about a hundred specimens were obtained. On subsequent visits to 

 the dredge Mr. L. C. Bragg found them in greater or less abundance. 



lhe specimens were all large, some of them reaching 31 in. in length. 

 But very lew of them were sexually mature July 1st. Surface skim- 

 ming never brought the eggs or larv*. There i 



nged as follows : 45 to atrial pore ; 16 from 

 atrial pore to anus ; 9 behind anus. 



The sp e C ie S may be identical ^ BrancMostoma el tum Sunde . 

 vail from the coast of Peru, as Dr. Jordan has suggested. The formula 

 49+ I 18+lT Ver ' ^ myOCOmmaS iu the Peruvian specimens being 



To those engaged in teaching it may be of interest to know that 

 specimens of this Amphioxus may be obtained of Mr. L. C. Bragg, 

 Coronado Beech, California^. H. Eigenmann, Bloomington, 

 Indiana. 



