1909] Hitter: Ualocynthia johngoni a. sp. 69 



figs. 2 and 3 . the lobes adherent to the mantle on their outer 

 surface, and the branchial membrane on their inner; many of 

 the lobes containing both male and female elements. 



3. Some Further Anatomical Points. 



The only points so far recognized which differentiate the 

 California from the Washington species are in the structure of 

 the lest and the number of the tentacles. Test tubercles are 

 prominent and hardly ever wanting in //. liaustor. These are 

 well shown in figures drawn from living specimens by Professor 

 Bashford Dean I Hitter. 1900, Plate XVIII, figs. 8, 9, 1"'. Von 

 Drasche speaks of the test as being very characteristic, and de- 

 scribes it as follows: "Sie wird von einem Netzwerk erhabener 

 Riicken gebildet, welche von einander durch polygonal begrentze 

 Depressionen getrennt werden" (von Drasche, '84, p. 372). 

 This characterizes admirably many old alcoholic specimens, bul 

 it is not adequate for living or even well-preserved formalde- 

 hyde material. In many eases the tubercles are quite wartlike. 

 tit times becoming almost pedunculate. At best a mere sugges- 

 tion of these is present in //. johnsoni, and in a vast majority 

 of the specimens nothing of the sort is visible. Examination 

 of sections reveals the fact that the test of haustor is much more 

 vascular than is that of johnsoni, and that the tubercles are the 

 'chief seat of the vessels. Plate 11, figs. 8. 9, 10. illustrate this. 

 Figure 8 is from //. johnsoni and represents what seems to be 

 a typical condition as regards vessels in this species. In all 

 likelihood specimens and areas might he found more vascular 

 than the piece here figured, hut the individual selected was one 

 in which the test was at about the maximum of fleshiness, it being 

 assumed that such condition would present the highest degree 

 of vascularity. Figure 9 presents what seems to be a typical 

 condition of the liaustor test in the areas between the ridges. 

 Figure In is from a section of one of the tubercles. It tells 

 its own story as to the vessels. The bulbous termination of many 

 of them much resembles the corresponding structures in the 

 common test of several compound axcidians. notably the Botryl- 

 lids and Polystyelids. 



