24 VERRILL, SYNOPSIS OF 



ing a convex caespitose clump. The corallites are large, 

 open, tubular, with the cells not appressed, opening up- 

 ward, with the exterior evenly costate. The terminal coral- 

 lites are but little larger than the lateral, somewhat exsert. 

 The cells are all deep, with the star in most of them indis- 

 tinct. 



Tahiti. Dr. Wm. Stimpson. 



MADREPORA STRIATA Verrill, nov. sp. 



Corallum subarborescent ; closely branched and much 

 subdivided above, covered on all sides with crowded lateral 

 branchlets. which are much smaller on one side of the trunk, 

 indicating that the coral grew in an oblique or horizontal 

 position. The branchlets on the lower side are numerous, 

 about half an inch long, abruptly spreading, and consist of a 

 cluster of several elongated, leading corallites, with a few 

 smaller lateral ones. On the upper side, and towards the 

 end, the branchlets become from one to two inches long, slen- 

 der and much subdivided, the subdivisions always spreading at 

 a large angle like the branchlets themselves. On all sides 

 of the trunk and large branches immersed cells occur, of 

 rather large size. 



Terminal corallites elongated, tubular, considerably ex- 

 sert, the exterior neatly costate, with pores between the 

 ribs ; walls but little thickened ; cells but little larger than 

 the lateral ones, deep, with twelve narrow septa. Lateral 

 corallites large, open, tubuliform or somewhat cochleari- 

 form, opening upward, not crowded nor appressed, the ex- 

 terior costate ; the costse with minute, short spines. Cells 

 large, with a well marked star of six septa, and often with 

 minute ones of the second cycle between ; two of the princi- 

 pal septa meet at the middle. Coenenchyma very firm, with 

 scattered, irregular pores, the surface minutely spiuulous. 



Height of the largest specimen 13 inches ; diameter of 

 trunk at base 1.5 ; diameter of lateral cells .08. 



? Ousima, Japan. Dr. Wm. Stimpson. 



This species branches somewhat like M. carduus and M. 

 rosaria Dana, but the corallites are entirely different in 

 form. 



