BY R. VOX LEXDENFELD, PH.D. 1135 



of the body is smooth. Gastral cavity 3 to 4 mm., in diameter, 

 the wall of the body 2 to 3 mm., cortex 4 mm. The canals of the 

 cortex are pretty regular and large loculi of 1 mm., in length and 

 0-3 — 0*4 mm., in width. They are like the regular radial-canals 

 of the sycones. They communicate by conjunctif-pores, and open 

 outward by the dermal peres, inward into the Parenchyma. The 

 canals of the parenchyma are quite irregular, partly very narrow, 

 partly pretty broad, and open into Gastral pores of very varying 

 diameter. 



Skeleton : The main skeleton consists of Quadriradiate spicules. 

 There are 4 clearly distinct separate layers. 1. Outside a dermal 

 layer of Triradiate spicules mixed with single Acerates. 2. A 

 regular layer of large Quadriradiate spicules. 3. An irregular 

 layer of middle-sized Quadriradiate spicules, and 4, a Gastral 

 coating of Triradiates. The first layer consists of Triradiates which 

 are mostly slightly irregular. Their rays are straight, pointed, 

 and measure 015 — - 25 mm. x - 02 mm. Between theiu in 

 varying quantity longitudinal, spindle-shaped Acerates are 

 situated, measuring 0*1 — 1*5 mm. x ol — - 06 mm., these are 

 straight or slightly curved. Below the cortex we meet with a 

 peculiar lacunose layer, which is composed of two layers Quadri- 

 radiates. The apical ray is vertical on the plane of the three 

 lateral rays, and is situated centripetally in the outer, and 

 centrifugally in the inner layer. The radial rays join as in 

 Amphoriscus. The inner Quadriradiates are smaller than the 

 outer ones. Radial rays straight and pointed, lateral rays 

 slightly curved. The rays of the Quadriradiates measure 6 — 

 9 x - 06 mm. The central canal is often particularly well 

 visible. Below these lies the Parenchyma, supported by irregular 

 Quadriradiates. Their rays measure 0-1 — 0*8 mm. x 002 — 0'05 

 mm, they are mostly straight or very slightly bent. The wall of 

 the stomach and the larger exhalent canals is quoted with sagittal 

 middle-sized Triradiates. The basal ray measures 0-1 — 0-4 mm., 

 in length and is situated radially. It forms an angle of 100° with 

 the lateral rays. These measure 0*2 — 0;3 mm. in length. All 

 rays 02 — 03 mm. thick. The skeleton of Peristome consists of 

 two layers, on inner one of Triradiates and an outer of Acerates. 



